lldb/Core/Module.h

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

#ifndef liblldb_Module_h_
#define liblldb_Module_h_

#include "lldb/Core/ArchSpec.h"
#include "lldb/Core/UUID.h"
#include "lldb/Host/FileSpec.h"
#include "lldb/Host/Mutex.h"
#include "lldb/Host/TimeValue.h"
#include "lldb/Symbol/ClangASTContext.h"
#include "lldb/Symbol/SymbolContextScope.h"
#include "lldb/Target/PathMappingList.h"

namespace lldb_private {

//----------------------------------------------------------------------
/// @class Module Module.h "lldb/Core/Module.h"
/// @brief A class that describes an executable image and its associated
///        object and symbol files.
///
/// The module is designed to be able to select a single slice of an
/// executable image as it would appear on disk and during program
/// execution.
///
/// Modules control when and if information is parsed according to which
/// accessors are called. For example the object file (ObjectFile)
/// representation will only be parsed if the object file is requested
/// using the Module::GetObjectFile() is called. The debug symbols
/// will only be parsed if the symbol vendor (SymbolVendor) is
/// requested using the Module::GetSymbolVendor() is called.
///
/// The module will parse more detailed information as more queries are
/// made.
//----------------------------------------------------------------------
class Module :
    public std::enable_shared_from_this<Module>,
    public SymbolContextScope
{
public:
	// Static functions that can track the lifetime of module objects.
	// This is handy because we might have Module objects that are in
	// shared pointers that aren't in the global module list (from
	// ModuleList). If this is the case we need to know about it.
    // The modules in the global list maintained by these functions
    // can be viewed using the "target modules list" command using the
    // "--global" (-g for short).
    static size_t
    GetNumberAllocatedModules ();

    static Module *
    GetAllocatedModuleAtIndex (size_t idx);

    static Mutex *
    GetAllocationModuleCollectionMutex();

    //------------------------------------------------------------------
    /// Construct with file specification and architecture.
    ///
    /// Clients that wish to share modules with other targets should
    /// use ModuleList::GetSharedModule().
    ///
    /// @param[in] file_spec
    ///     The file specification for the on disk repesentation of
    ///     this executable image.
    ///
    /// @param[in] arch
    ///     The architecture to set as the current architecture in
    ///     this module.
    ///
    /// @param[in] object_name
    ///     The name of an object in a module used to extract a module
    ///     within a module (.a files and modules that contain multiple
    ///     architectures).
    ///
    /// @param[in] object_offset
    ///     The offset within an existing module used to extract a
    ///     module within a module (.a files and modules that contain
    ///     multiple architectures).
    //------------------------------------------------------------------
    Module (const FileSpec& file_spec,
            const ArchSpec& arch,
            const ConstString *object_name = NULL,
            off_t object_offset = 0,
            const TimeValue *object_mod_time_ptr = NULL);

    Module (const ModuleSpec &module_spec);
    //------------------------------------------------------------------
    /// Destructor.
    //------------------------------------------------------------------
    virtual
    ~Module ();

    bool
    MatchesModuleSpec (const ModuleSpec &module_ref);

    //------------------------------------------------------------------
    /// Set the load address for all sections in a module to be the
    /// file address plus \a slide.
    ///
    /// Many times a module will be loaded in a target with a constant
    /// offset applied to all top level sections. This function can
    /// set the load address for all top level sections to be the
    /// section file address + offset.
    ///
    /// @param[in] target
    ///     The target in which to apply the section load addresses.
    ///
    /// @param[in] value
    ///     if \a value_is_offset is true, then value is the offset to
    ///     apply to all file addresses for all top level sections in
    ///     the object file as each section load address is being set.
    ///     If \a value_is_offset is false, then "value" is the new
    ///     absolute base address for the image.
    ///
    /// @param[in] value_is_offset
    ///     If \b true, then \a value is an offset to apply to each
    ///     file address of each top level section.
    ///     If \b false, then \a value is the image base address that
    ///     will be used to rigidly slide all loadable sections.
    ///
    /// @param[out] changed
    ///     If any section load addresses were changed in \a target,
    ///     then \a changed will be set to \b true. Else \a changed
    ///     will be set to false. This allows this function to be
    ///     called multiple times on the same module for the same
    ///     target. If the module hasn't moved, then \a changed will
    ///     be false and no module updated notification will need to
    ///     be sent out.
    ///
    /// @return
    ///     /b True if any sections were successfully loaded in \a target,
    ///     /b false otherwise.
    //------------------------------------------------------------------
    bool
    SetLoadAddress (Target &target,
                    lldb::addr_t value,
                    bool value_is_offset,
                    bool &changed);

    //------------------------------------------------------------------
    /// @copydoc SymbolContextScope::CalculateSymbolContext(SymbolContext*)
    ///
    /// @see SymbolContextScope
    //------------------------------------------------------------------
    virtual void
    CalculateSymbolContext (SymbolContext* sc);

    virtual lldb::ModuleSP
    CalculateSymbolContextModule ();

    void
    GetDescription (Stream *s,
                    lldb::DescriptionLevel level = lldb::eDescriptionLevelFull);

    //------------------------------------------------------------------
    /// Get the module path and object name.
    ///
    /// Modules can refer to object files. In this case the specification
    /// is simple and would return the path to the file:
    ///
    ///     "/usr/lib/foo.dylib"
    ///
    /// Modules can be .o files inside of a BSD archive (.a file). In
    /// this case, the object specification will look like:
    ///
    ///     "/usr/lib/foo.a(bar.o)"
    ///
    /// There are many places where logging wants to log this fully
    /// qualified specification, so we centralize this functionality
    /// here.
    ///
    /// @return
    ///     The object path + object name if there is one.
    //------------------------------------------------------------------
    std::string
    GetSpecificationDescription () const;

    //------------------------------------------------------------------
    /// Dump a description of this object to a Stream.
    ///
    /// Dump a description of the contents of this object to the
    /// supplied stream \a s. The dumped content will be only what has
    /// been loaded or parsed up to this point at which this function
    /// is called, so this is a good way to see what has been parsed
    /// in a module.
    ///
    /// @param[in] s
    ///     The stream to which to dump the object descripton.
    //------------------------------------------------------------------
    void
    Dump (Stream *s);

    //------------------------------------------------------------------
    /// @copydoc SymbolContextScope::DumpSymbolContext(Stream*)
    ///
    /// @see SymbolContextScope
    //------------------------------------------------------------------
    virtual void
    DumpSymbolContext (Stream *s);


    //------------------------------------------------------------------
    /// Find a symbol in the object file's symbol table.
    ///
    /// @param[in] name
    ///     The name of the symbol that we are looking for.
    ///
    /// @param[in] symbol_type
    ///     If set to eSymbolTypeAny, find a symbol of any type that
    ///     has a name that matches \a name. If set to any other valid
    ///     SymbolType enumeration value, then search only for
    ///     symbols that match \a symbol_type.
    ///
    /// @return
    ///     Returns a valid symbol pointer if a symbol was found,
    ///     NULL otherwise.
    //------------------------------------------------------------------
    const Symbol *
    FindFirstSymbolWithNameAndType (const ConstString &name,
                                    lldb::SymbolType symbol_type = lldb::eSymbolTypeAny);

    size_t
    FindSymbolsWithNameAndType (const ConstString &name,
                                lldb::SymbolType symbol_type,
                                SymbolContextList &sc_list);

    size_t
    FindSymbolsMatchingRegExAndType (const RegularExpression &regex,
                                     lldb::SymbolType symbol_type,
                                     SymbolContextList &sc_list);

    //------------------------------------------------------------------
    /// Find a funciton symbols in the object file's symbol table.
    ///
    /// @param[in] name
    ///     The name of the symbol that we are looking for.
    ///
    /// @param[in] name_type_mask
    ///     A mask that has one or more bitwise OR'ed values from the
    ///     lldb::FunctionNameType enumeration type that indicate what
    ///     kind of names we are looking for.
    ///
    /// @param[out] sc_list
    ///     A list to append any matching symbol contexts to.
    ///
    /// @return
    ///     The number of symbol contexts that were added to \a sc_list
    //------------------------------------------------------------------
    size_t
    FindFunctionSymbols (const ConstString &name,
                         uint32_t name_type_mask,
                         SymbolContextList& sc_list);

    //------------------------------------------------------------------
    /// Find compile units by partial or full path.
    ///
    /// Finds all compile units that match \a path in all of the modules
    /// and returns the results in \a sc_list.
    ///
    /// @param[in] path
    ///     The name of the function we are looking for.
    ///
    /// @param[in] append
    ///     If \b true, then append any compile units that were found
    ///     to \a sc_list. If \b false, then the \a sc_list is cleared
    ///     and the contents of \a sc_list are replaced.
    ///
    /// @param[out] sc_list
    ///     A symbol context list that gets filled in with all of the
    ///     matches.
    ///
    /// @return
    ///     The number of matches added to \a sc_list.
    //------------------------------------------------------------------
    size_t
    FindCompileUnits (const FileSpec &path,
                      bool append,
                      SymbolContextList &sc_list);


    //------------------------------------------------------------------
    /// Find functions by name.
    ///
    /// If the function is an inlined function, it will have a block,
    /// representing the inlined function, and the function will be the
    /// containing function.  If it is not inlined, then the block will
    /// be NULL.
    ///
    /// @param[in] name
    ///     The name of the compile unit we are looking for.
    ///
    /// @param[in] namespace_decl
    ///     If valid, a namespace to search in.
    ///
    /// @param[in] name_type_mask
    ///     A bit mask of bits that indicate what kind of names should
    ///     be used when doing the lookup. Bits include fully qualified
    ///     names, base names, C++ methods, or ObjC selectors.
    ///     See FunctionNameType for more details.
    ///
    /// @param[in] append
    ///     If \b true, any matches will be appended to \a sc_list, else
    ///     matches replace the contents of \a sc_list.
    ///
    /// @param[out] sc_list
    ///     A symbol context list that gets filled in with all of the
    ///     matches.
    ///
    /// @return
    ///     The number of matches added to \a sc_list.
    //------------------------------------------------------------------
    size_t
    FindFunctions (const ConstString &name,
                   const ClangNamespaceDecl *namespace_decl,
                   uint32_t name_type_mask,
                   bool symbols_ok,
                   bool inlines_ok,
                   bool append,
                   SymbolContextList& sc_list);

    //------------------------------------------------------------------
    /// Find functions by name.
    ///
    /// If the function is an inlined function, it will have a block,
    /// representing the inlined function, and the function will be the
    /// containing function.  If it is not inlined, then the block will
    /// be NULL.
    ///
    /// @param[in] regex
    ///     A regular expression to use when matching the name.
    ///
    /// @param[in] append
    ///     If \b true, any matches will be appended to \a sc_list, else
    ///     matches replace the contents of \a sc_list.
    ///
    /// @param[out] sc_list
    ///     A symbol context list that gets filled in with all of the
    ///     matches.
    ///
    /// @return
    ///     The number of matches added to \a sc_list.
    //------------------------------------------------------------------
    size_t
    FindFunctions (const RegularExpression& regex,
                   bool symbols_ok,
                   bool inlines_ok,
                   bool append,
                   SymbolContextList& sc_list);

    //------------------------------------------------------------------
    /// Find addresses by file/line
    ///
    /// @param[in] target_sp
    ///     The target the addresses are desired for.
    ///
    /// @param[in] file
    ///     Source file to locate.
    ///
    /// @param[in] line
    ///     Source line to locate.
    ///
    /// @param[in] function
    ///	    Optional filter function. Addresses within this function will be
    ///     added to the 'local' list. All others will be added to the 'extern' list.
    ///
    /// @param[out] output_local
    ///     All matching addresses within 'function'
    ///
    /// @param[out] output_extern
    ///     All matching addresses not within 'function'
    void FindAddressesForLine (const lldb::TargetSP target_sp,
                               const FileSpec &file, uint32_t line,
                               Function *function,
                               std::vector<Address> &output_local, std::vector<Address> &output_extern);

    //------------------------------------------------------------------
    /// Find global and static variables by name.
    ///
    /// @param[in] name
    ///     The name of the global or static variable we are looking
    ///     for.
    ///
    /// @param[in] namespace_decl
    ///     If valid, a namespace to search in.
    ///
    /// @param[in] append
    ///     If \b true, any matches will be appended to \a
    ///     variable_list, else matches replace the contents of
    ///     \a variable_list.
    ///
    /// @param[in] max_matches
    ///     Allow the number of matches to be limited to \a
    ///     max_matches. Specify UINT32_MAX to get all possible matches.
    ///
    /// @param[in] variable_list
    ///     A list of variables that gets the matches appended to (if
    ///     \a append it \b true), or replace (if \a append is \b false).
    ///
    /// @return
    ///     The number of matches added to \a variable_list.
    //------------------------------------------------------------------
    size_t
    FindGlobalVariables (const ConstString &name,
                         const ClangNamespaceDecl *namespace_decl,
                         bool append,
                         size_t max_matches,
                         VariableList& variable_list);

    //------------------------------------------------------------------
    /// Find global and static variables by regular exression.
    ///
    /// @param[in] regex
    ///     A regular expression to use when matching the name.
    ///
    /// @param[in] append
    ///     If \b true, any matches will be appended to \a
    ///     variable_list, else matches replace the contents of
    ///     \a variable_list.
    ///
    /// @param[in] max_matches
    ///     Allow the number of matches to be limited to \a
    ///     max_matches. Specify UINT32_MAX to get all possible matches.
    ///
    /// @param[in] variable_list
    ///     A list of variables that gets the matches appended to (if
    ///     \a append it \b true), or replace (if \a append is \b false).
    ///
    /// @return
    ///     The number of matches added to \a variable_list.
    //------------------------------------------------------------------
    size_t
    FindGlobalVariables (const RegularExpression& regex,
                         bool append,
                         size_t max_matches,
                         VariableList& variable_list);

    //------------------------------------------------------------------
    /// Find types by name.
    ///
    /// Type lookups in modules go through the SymbolVendor (which will
    /// use one or more SymbolFile subclasses). The SymbolFile needs to
    /// be able to lookup types by basename and not the fully qualified
    /// typename. This allows the type accelerator tables to stay small,
    /// even with heavily templatized C++. The type search will then
    /// narrow down the search results. If "exact_match" is true, then
    /// the type search will only match exact type name matches. If
    /// "exact_match" is false, the type will match as long as the base
    /// typename matches and as long as any immediate containing
    /// namespaces/class scopes that are specified match. So to search
    /// for a type "d" in "b::c", the name "b::c::d" can be specified
    /// and it will match any class/namespace "b" which contains a
    /// class/namespace "c" which contains type "d". We do this to
    /// allow users to not always have to specify complete scoping on
    /// all expressions, but it also allows for exact matching when
    /// required.
    ///
    /// @param[in] sc
    ///     A symbol context that scopes where to extract a type list
    ///     from.
    ///
    /// @param[in] type_name
    ///     The name of the type we are looking for that is a fully
    ///     or partially qualfieid type name.
    ///
    /// @param[in] exact_match
    ///     If \b true, \a type_name is fully qualifed and must match
    ///     exactly. If \b false, \a type_name is a partially qualfied
    ///     name where the leading namespaces or classes can be
    ///     omitted to make finding types that a user may type
    ///     easier.
    ///
    /// @param[out] type_list
    ///     A type list gets populated with any matches.
    ///
    /// @return
    ///     The number of matches added to \a type_list.
    //------------------------------------------------------------------
    size_t
    FindTypes (const SymbolContext& sc,
               const ConstString &type_name,
               bool exact_match,
               size_t max_matches,
               TypeList& types);

    lldb::TypeSP
    FindFirstType (const SymbolContext& sc,
                   const ConstString &type_name,
                   bool exact_match);

    //------------------------------------------------------------------
    /// Find types by name that are in a namespace. This function is
    /// used by the expression parser when searches need to happen in
    /// an exact namespace scope.
    ///
    /// @param[in] sc
    ///     A symbol context that scopes where to extract a type list
    ///     from.
    ///
    /// @param[in] type_name
    ///     The name of a type within a namespace that should not include
    ///     any qualifying namespaces (just a type basename).
    ///
    /// @param[in] namespace_decl
    ///     The namespace declaration that this type must exist in.
    ///
    /// @param[out] type_list
    ///     A type list gets populated with any matches.
    ///
    /// @return
    ///     The number of matches added to \a type_list.
    //------------------------------------------------------------------
    size_t
    FindTypesInNamespace (const SymbolContext& sc,
                          const ConstString &type_name,
                          const ClangNamespaceDecl *namespace_decl,
                          size_t max_matches,
                          TypeList& type_list);

    //------------------------------------------------------------------
    /// Get const accessor for the module architecture.
    ///
    /// @return
    ///     A const reference to the architecture object.
    //------------------------------------------------------------------
    const ArchSpec&
    GetArchitecture () const;

    //------------------------------------------------------------------
    /// Get const accessor for the module file specification.
    ///
    /// This function returns the file for the module on the host system
    /// that is running LLDB. This can differ from the path on the
    /// platform since we might be doing remote debugging.
    ///
    /// @return
    ///     A const reference to the file specification object.
    //------------------------------------------------------------------
    const FileSpec &
    GetFileSpec () const
    {
        return m_file;
    }

    //------------------------------------------------------------------
    /// Get accessor for the module platform file specification.
    ///
    /// Platform file refers to the path of the module as it is known on
    /// the remote system on which it is being debugged. For local
    /// debugging this is always the same as Module::GetFileSpec(). But
    /// remote debugging might mention a file "/usr/lib/liba.dylib"
    /// which might be locally downloaded and cached. In this case the
    /// platform file could be something like:
    /// "/tmp/lldb/platform-cache/remote.host.computer/usr/lib/liba.dylib"
    /// The file could also be cached in a local developer kit directory.
    ///
    /// @return
    ///     A const reference to the file specification object.
    //------------------------------------------------------------------
    const FileSpec &
    GetPlatformFileSpec () const
    {
        if (m_platform_file)
            return m_platform_file;
        return m_file;
    }

    void
    SetPlatformFileSpec (const FileSpec &file)
    {
        m_platform_file = file;
    }

    const FileSpec &
    GetRemoteInstallFileSpec () const
    {
        return m_remote_install_file;
    }

    void
    SetRemoteInstallFileSpec (const FileSpec &file)
    {
        m_remote_install_file = file;
    }

    const FileSpec &
    GetSymbolFileFileSpec () const
    {
        return m_symfile_spec;
    }

    void
    SetSymbolFileFileSpec (const FileSpec &file);

    const TimeValue &
    GetModificationTime () const
    {
        return m_mod_time;
    }

    const TimeValue &
    GetObjectModificationTime () const
    {
        return m_object_mod_time;
    }

    void
    SetObjectModificationTime (const TimeValue &mod_time)
    {
        m_mod_time = mod_time;
    }

    //------------------------------------------------------------------
    /// Tells whether this module is capable of being the main executable
    /// for a process.
    ///
    /// @return
    ///     \b true if it is, \b false otherwise.
    //------------------------------------------------------------------
    bool
    IsExecutable ();

    //------------------------------------------------------------------
    /// Tells whether this module has been loaded in the target passed in.
    /// This call doesn't distinguish between whether the module is loaded
    /// by the dynamic loader, or by a "target module add" type call.
    ///
    /// @param[in] target
    ///    The target to check whether this is loaded in.
    ///
    /// @return
    ///     \b true if it is, \b false otherwise.
    //------------------------------------------------------------------
    bool
    IsLoadedInTarget (Target *target);

    bool
    LoadScriptingResourceInTarget (Target *target,
                                   Error& error,
                                   Stream* feedback_stream = NULL);

    //------------------------------------------------------------------
    /// Get the number of compile units for this module.
    ///
    /// @return
    ///     The number of compile units that the symbol vendor plug-in
    ///     finds.
    //------------------------------------------------------------------
    size_t
    GetNumCompileUnits();

    lldb::CompUnitSP
    GetCompileUnitAtIndex (size_t idx);

    const ConstString &
    GetObjectName() const;

    uint64_t
    GetObjectOffset() const
    {
        return m_object_offset;
    }

    //------------------------------------------------------------------
    /// Get the object file representation for the current architecture.
    ///
    /// If the object file has not been located or parsed yet, this
    /// function will find the best ObjectFile plug-in that can parse
    /// Module::m_file.
    ///
    /// @return
    ///     If Module::m_file does not exist, or no plug-in was found
    ///     that can parse the file, or the object file doesn't contain
    ///     the current architecture in Module::m_arch, NULL will be
    ///     returned, else a valid object file interface will be
    ///     returned. The returned pointer is owned by this object and
    ///     remains valid as long as the object is around.
    //------------------------------------------------------------------
    virtual ObjectFile *
    GetObjectFile ();

    //------------------------------------------------------------------
    /// Get the unified section list for the module. This is the section
    /// list created by the module's object file and any debug info and
    /// symbol files created by the symbol vendor.
    ///
    /// If the symbol vendor has not been loaded yet, this function
    /// will return the section list for the object file.
    ///
    /// @return
    ///     Unified module section list.
    //------------------------------------------------------------------
    virtual SectionList *
    GetSectionList ();

    uint32_t
    GetVersion (uint32_t *versions, uint32_t num_versions);

    // Load an object file from memory.
    ObjectFile *
    GetMemoryObjectFile (const lldb::ProcessSP &process_sp,
                         lldb::addr_t header_addr,
                         Error &error);
    //------------------------------------------------------------------
    /// Get the symbol vendor interface for the current architecture.
    ///
    /// If the symbol vendor file has not been located yet, this
    /// function will find the best SymbolVendor plug-in that can
    /// use the current object file.
    ///
    /// @return
    ///     If this module does not have a valid object file, or no
    ///     plug-in can be found that can use the object file, NULL will
    ///     be returned, else a valid symbol vendor plug-in interface
    ///     will be returned. The returned pointer is owned by this
    ///     object and remains valid as long as the object is around.
    //------------------------------------------------------------------
    virtual SymbolVendor*
    GetSymbolVendor(bool can_create = true,
                    lldb_private::Stream *feedback_strm = NULL);

    //------------------------------------------------------------------
    /// Get accessor the type list for this module.
    ///
    /// @return
    ///     A valid type list pointer, or NULL if there is no valid
    ///     symbol vendor for this module.
    //------------------------------------------------------------------
    TypeList*
    GetTypeList ();

    //------------------------------------------------------------------
    /// Get a pointer to the UUID value contained in this object.
    ///
    /// If the executable image file doesn't not have a UUID value built
    /// into the file format, an MD5 checksum of the entire file, or
    /// slice of the file for the current architecture should be used.
    ///
    /// @return
    ///     A const pointer to the internal copy of the UUID value in
    ///     this module if this module has a valid UUID value, NULL
    ///     otherwise.
    //------------------------------------------------------------------
    const lldb_private::UUID &
    GetUUID ();

    //------------------------------------------------------------------
    /// A debugging function that will cause everything in a module to
    /// be parsed.
    ///
    /// All compile units will be pasred, along with all globals and
    /// static variables and all functions for those compile units.
    /// All types, scopes, local variables, static variables, global
    /// variables, and line tables will be parsed. This can be used
    /// prior to dumping a module to see a complete list of the
    /// resuling debug information that gets parsed, or as a debug
    /// function to ensure that the module can consume all of the
    /// debug data the symbol vendor provides.
    //------------------------------------------------------------------
    void
    ParseAllDebugSymbols();

    bool
    ResolveFileAddress (lldb::addr_t vm_addr, Address& so_addr);

    //------------------------------------------------------------------
    /// Resolve the symbol context for the given address.
    ///
    /// Tries to resolve the matching symbol context based on a lookup
    /// from the current symbol vendor.  If the lazy lookup fails,
    /// an attempt is made to parse the eh_frame section to handle
    /// stripped symbols.  If this fails, an attempt is made to resolve
    /// the symbol to the previous address to handle the case of a
    /// function with a tail call.
    ///
    /// Use properties of the modified SymbolContext to inspect any
    /// resolved target, module, compilation unit, symbol, function,
    /// function block or line entry.  Use the return value to determine
    /// which of these properties have been modified.
    ///
    /// @param[in] so_addr
    ///     A load address to resolve.
    ///
    /// @param[in] resolve_scope
    ///     The scope that should be resolved (see SymbolContext::Scope).
    ///     A combination of flags from the enumeration SymbolContextItem
    ///     requesting a resolution depth.  Note that the flags that are
    ///     actually resolved may be a superset of the requested flags.
    ///     For instance, eSymbolContextSymbol requires resolution of
    ///     eSymbolContextModule, and eSymbolContextFunction requires
    ///     eSymbolContextSymbol.
    ///
    /// @param[out] sc
    ///     The SymbolContext that is modified based on symbol resolution.
    ///
    /// @param[in] resolve_tail_call_address
    ///     Determines if so_addr should resolve to a symbol in the case
    ///     of a function whose last instruction is a call.  In this case,
    ///     the PC can be one past the address range of the function.
    ///
    /// @return
    ///     The scope that has been resolved (see SymbolContext::Scope).
    ///
    /// @see SymbolContext::Scope
    //------------------------------------------------------------------
    uint32_t
    ResolveSymbolContextForAddress (const Address& so_addr, uint32_t resolve_scope,
                                    SymbolContext& sc, bool resolve_tail_call_address = false);

    //------------------------------------------------------------------
    /// Resolve items in the symbol context for a given file and line.
    ///
    /// Tries to resolve \a file_path and \a line to a list of matching
    /// symbol contexts.
    ///
    /// The line table entries contains addresses that can be used to
    /// further resolve the values in each match: the function, block,
    /// symbol. Care should be taken to minimize the amount of
    /// information that is requested to only what is needed --
    /// typically the module, compile unit, line table and line table
    /// entry are sufficient.
    ///
    /// @param[in] file_path
    ///     A path to a source file to match. If \a file_path does not
    ///     specify a directory, then this query will match all files
    ///     whose base filename matches. If \a file_path does specify
    ///     a directory, the fullpath to the file must match.
    ///
    /// @param[in] line
    ///     The source line to match, or zero if just the compile unit
    ///     should be resolved.
    ///
    /// @param[in] check_inlines
    ///     Check for inline file and line number matches. This option
    ///     should be used sparingly as it will cause all line tables
    ///     for every compile unit to be parsed and searched for
    ///     matching inline file entries.
    ///
    /// @param[in] resolve_scope
    ///     The scope that should be resolved (see
    ///     SymbolContext::Scope).
    ///
    /// @param[out] sc_list
    ///     A symbol context list that gets matching symbols contexts
    ///     appended to.
    ///
    /// @return
    ///     The number of matches that were added to \a sc_list.
    ///
    /// @see SymbolContext::Scope
    //------------------------------------------------------------------
    uint32_t
    ResolveSymbolContextForFilePath (const char *file_path, uint32_t line, bool check_inlines, uint32_t resolve_scope, SymbolContextList& sc_list);

    //------------------------------------------------------------------
    /// Resolve items in the symbol context for a given file and line.
    ///
    /// Tries to resolve \a file_spec and \a line to a list of matching
    /// symbol contexts.
    ///
    /// The line table entries contains addresses that can be used to
    /// further resolve the values in each match: the function, block,
    /// symbol. Care should be taken to minimize the amount of
    /// information that is requested to only what is needed --
    /// typically the module, compile unit, line table and line table
    /// entry are sufficient.
    ///
    /// @param[in] file_spec
    ///     A file spec to a source file to match. If \a file_path does
    ///     not specify a directory, then this query will match all
    ///     files whose base filename matches. If \a file_path does
    ///     specify a directory, the fullpath to the file must match.
    ///
    /// @param[in] line
    ///     The source line to match, or zero if just the compile unit
    ///     should be resolved.
    ///
    /// @param[in] check_inlines
    ///     Check for inline file and line number matches. This option
    ///     should be used sparingly as it will cause all line tables
    ///     for every compile unit to be parsed and searched for
    ///     matching inline file entries.
    ///
    /// @param[in] resolve_scope
    ///     The scope that should be resolved (see
    ///     SymbolContext::Scope).
    ///
    /// @param[out] sc_list
    ///     A symbol context list that gets filled in with all of the
    ///     matches.
    ///
    /// @return
    ///     A integer that contains SymbolContext::Scope bits set for
    ///     each item that was successfully resolved.
    ///
    /// @see SymbolContext::Scope
    //------------------------------------------------------------------
    uint32_t
    ResolveSymbolContextsForFileSpec (const FileSpec &file_spec, uint32_t line, bool check_inlines, uint32_t resolve_scope, SymbolContextList& sc_list);


    void
    SetFileSpecAndObjectName (const FileSpec &file,
                              const ConstString &object_name);

    bool
    GetIsDynamicLinkEditor () const
    {
        return m_is_dynamic_loader_module;
    }

    void
    SetIsDynamicLinkEditor (bool b)
    {
        m_is_dynamic_loader_module = b;
    }

    ClangASTContext &
    GetClangASTContext ();

    // Special error functions that can do printf style formatting that will prepend the message with
    // something appropriate for this module (like the architecture, path and object name (if any)).
    // This centralizes code so that everyone doesn't need to format their error and log messages on
    // their own and keeps the output a bit more consistent.
    void
    LogMessage (Log *log, const char *format, ...) __attribute__ ((format (printf, 3, 4)));

    void
    LogMessageVerboseBacktrace (Log *log, const char *format, ...) __attribute__ ((format (printf, 3, 4)));

    void
    ReportWarning (const char *format, ...) __attribute__ ((format (printf, 2, 3)));

    void
    ReportError (const char *format, ...) __attribute__ ((format (printf, 2, 3)));

    // Only report an error once when the module is first detected to be modified
    // so we don't spam the console with many messages.
    void
    ReportErrorIfModifyDetected (const char *format, ...) __attribute__ ((format (printf, 2, 3)));

    //------------------------------------------------------------------
    // Return true if the file backing this module has changed since the
    // module was originally created  since we saved the intial file
    // modification time when the module first gets created.
    //------------------------------------------------------------------
    bool
    FileHasChanged () const;

    //------------------------------------------------------------------
    // SymbolVendor, SymbolFile and ObjectFile member objects should
    // lock the module mutex to avoid deadlocks.
    //------------------------------------------------------------------
    Mutex &
    GetMutex () const
    {
        return m_mutex;
    }

    PathMappingList &
    GetSourceMappingList ()
    {
        return m_source_mappings;
    }

    const PathMappingList &
    GetSourceMappingList () const
    {
        return m_source_mappings;
    }

    //------------------------------------------------------------------
    /// Finds a source file given a file spec using the module source
    /// path remappings (if any).
    ///
    /// Tries to resolve \a orig_spec by checking the module source path
    /// remappings. It makes sure the file exists, so this call can be
    /// expensive if the remappings are on a network file system, so
    /// use this function sparingly (not in a tight debug info parsing
    /// loop).
    ///
    /// @param[in] orig_spec
    ///     The original source file path to try and remap.
    ///
    /// @param[out] new_spec
    ///     The newly remapped filespec that is guaranteed to exist.
    ///
    /// @return
    ///     /b true if \a orig_spec was successfully located and
    ///     \a new_spec is filled in with an existing file spec,
    ///     \b false otherwise.
    //------------------------------------------------------------------
    bool
    FindSourceFile (const FileSpec &orig_spec, FileSpec &new_spec) const;

    //------------------------------------------------------------------
    /// Remaps a source file given \a path into \a new_path.
    ///
    /// Remaps \a path if any source remappings match. This function
    /// does NOT stat the file system so it can be used in tight loops
    /// where debug info is being parsed.
    ///
    /// @param[in] path
    ///     The original source file path to try and remap.
    ///
    /// @param[out] new_path
    ///     The newly remapped filespec that is may or may not exist.
    ///
    /// @return
    ///     /b true if \a path was successfully located and \a new_path
    ///     is filled in with a new source path, \b false otherwise.
    //------------------------------------------------------------------
    bool
    RemapSourceFile (const char *path, std::string &new_path) const;


    //------------------------------------------------------------------
    /// Prepare to do a function name lookup.
    ///
    /// Looking up functions by name can be a tricky thing. LLDB requires
    /// that accelerator tables contain full names for functions as well
    /// as function basenames which include functions, class methods and
    /// class functions. When the user requests that an action use a
    /// function by name, we are sometimes asked to automatically figure
    /// out what a name could possibly map to. A user might request a
    /// breakpoint be set on "count". If no options are supplied to limit
    /// the scope of where to search for count, we will by default match
    /// any function names named "count", all class and instance methods
    /// named "count" (no matter what the namespace or contained context)
    /// and any selectors named "count". If a user specifies "a::b" we
    /// will search for the basename "b", and then prune the results that
    /// don't match "a::b" (note that "c::a::b" and "d::e::a::b" will
    /// match a query of "a::b".
    ///
    /// @param[in] name
    ///     The user supplied name to use in the lookup
    ///
    /// @param[in] name_type_mask
    ///     The mask of bits from lldb::FunctionNameType enumerations
    ///     that tell us what kind of name we are looking for.
    ///
    /// @param[out] lookup_name
    ///     The actual name that will be used when calling
    ///     SymbolVendor::FindFunctions() or Symtab::FindFunctionSymbols()
    ///
    /// @param[out] lookup_name_type_mask
    ///     The actual name mask that should be used in the calls to
    ///     SymbolVendor::FindFunctions() or Symtab::FindFunctionSymbols()
    ///
    /// @param[out] match_name_after_lookup
    ///     A boolean that indicates if we need to iterate through any
    ///     match results obtained from SymbolVendor::FindFunctions() or
    ///     Symtab::FindFunctionSymbols() to see if the name contains
    ///     \a name. For example if \a name is "a::b", this function will
    ///     return a \a lookup_name of "b", with \a match_name_after_lookup
    ///     set to true to indicate any matches will need to be checked
    ///     to make sure they contain \a name.
    //------------------------------------------------------------------
    static void
    PrepareForFunctionNameLookup (const ConstString &name,
                                  uint32_t name_type_mask,
                                  ConstString &lookup_name,
                                  uint32_t &lookup_name_type_mask,
                                  bool &match_name_after_lookup);

protected:
    //------------------------------------------------------------------
    // Member Variables
    //------------------------------------------------------------------
    mutable Mutex               m_mutex;        ///< A mutex to keep this object happy in multi-threaded environments.
    TimeValue                   m_mod_time;     ///< The modification time for this module when it was created.
    ArchSpec                    m_arch;         ///< The architecture for this module.
    lldb_private::UUID          m_uuid;         ///< Each module is assumed to have a unique identifier to help match it up to debug symbols.
    FileSpec                    m_file;         ///< The file representation on disk for this module (if there is one).
    FileSpec                    m_platform_file;///< The path to the module on the platform on which it is being debugged
    FileSpec                    m_remote_install_file;  ///< If set when debugging on remote platforms, this module will be installed at this location
    FileSpec                    m_symfile_spec; ///< If this path is valid, then this is the file that _will_ be used as the symbol file for this module
    ConstString                 m_object_name;  ///< The name an object within this module that is selected, or empty of the module is represented by \a m_file.
    uint64_t                    m_object_offset;
    TimeValue                   m_object_mod_time;
    lldb::ObjectFileSP          m_objfile_sp;   ///< A shared pointer to the object file parser for this module as it may or may not be shared with the SymbolFile
    std::unique_ptr<SymbolVendor> m_symfile_ap;   ///< A pointer to the symbol vendor for this module.
    ClangASTContext             m_ast;          ///< The AST context for this module.
    PathMappingList             m_source_mappings; ///< Module specific source remappings for when you have debug info for a module that doesn't match where the sources currently are
    std::unique_ptr<lldb_private::SectionList> m_sections_ap; ///< Unified section list for module that is used by the ObjectFile and and ObjectFile instances for the debug info

    bool                        m_did_load_objfile:1,
                                m_did_load_symbol_vendor:1,
                                m_did_parse_uuid:1,
                                m_did_init_ast:1,
                                m_is_dynamic_loader_module:1;
    mutable bool                m_file_has_changed:1,
                                m_first_file_changed_log:1;   /// See if the module was modified after it was initially opened.

    //------------------------------------------------------------------
    /// Resolve a file or load virtual address.
    ///
    /// Tries to resolve \a vm_addr as a file address (if \a
    /// vm_addr_is_file_addr is true) or as a load address if \a
    /// vm_addr_is_file_addr is false) in the symbol vendor.
    /// \a resolve_scope indicates what clients wish to resolve
    /// and can be used to limit the scope of what is parsed.
    ///
    /// @param[in] vm_addr
    ///     The load virtual address to resolve.
    ///
    /// @param[in] vm_addr_is_file_addr
    ///     If \b true, \a vm_addr is a file address, else \a vm_addr
    ///     if a load address.
    ///
    /// @param[in] resolve_scope
    ///     The scope that should be resolved (see
    ///     SymbolContext::Scope).
    ///
    /// @param[out] so_addr
    ///     The section offset based address that got resolved if
    ///     any bits are returned.
    ///
    /// @param[out] sc
    //      The symbol context that has objects filled in. Each bit
    ///     in the \a resolve_scope pertains to a member in the \a sc.
    ///
    /// @return
    ///     A integer that contains SymbolContext::Scope bits set for
    ///     each item that was successfully resolved.
    ///
    /// @see SymbolContext::Scope
    //------------------------------------------------------------------
    uint32_t
    ResolveSymbolContextForAddress (lldb::addr_t vm_addr,
                                    bool vm_addr_is_file_addr,
                                    uint32_t resolve_scope,
                                    Address& so_addr,
                                    SymbolContext& sc);

    void
    SymbolIndicesToSymbolContextList (Symtab *symtab,
                                      std::vector<uint32_t> &symbol_indexes,
                                      SymbolContextList &sc_list);

    bool
    SetArchitecture (const ArchSpec &new_arch);

    SectionList *
    GetUnifiedSectionList();

    friend class ModuleList;
    friend class ObjectFile;
    friend class SymbolFile;

private:

    size_t
    FindTypes_Impl (const SymbolContext& sc,
                    const ConstString &name,
                    const ClangNamespaceDecl *namespace_decl,
                    bool append,
                    size_t max_matches,
                    TypeList& types);


    DISALLOW_COPY_AND_ASSIGN (Module);
};

} // namespace lldb_private

#endif  // liblldb_Module_h_