C++ Process::GetTarget方法代码示例

SBError SBThread::ResumeNewPlan(ExecutionContext &exe_ctx,
                                ThreadPlan *new_plan) {
  SBError sb_error;

  Process *process = exe_ctx.GetProcessPtr();
  if (!process) {
    sb_error.SetErrorString("No process in SBThread::ResumeNewPlan");
    return sb_error;
  }

  Thread *thread = exe_ctx.GetThreadPtr();
  if (!thread) {
    sb_error.SetErrorString("No thread in SBThread::ResumeNewPlan");
    return sb_error;
  }

  // User level plans should be Master Plans so they can be interrupted, other
  // plans executed, and
  // then a "continue" will resume the plan.
  if (new_plan != NULL) {
    new_plan->SetIsMasterPlan(true);
    new_plan->SetOkayToDiscard(false);
  }

  // Why do we need to set the current thread by ID here???
  process->GetThreadList().SetSelectedThreadByID(thread->GetID());

  if (process->GetTarget().GetDebugger().GetAsyncExecution())
    sb_error.ref() = process->Resume();
  else
    sb_error.ref() = process->ResumeSynchronous(NULL);

  return sb_error;
}

clang::ASTContext *
ValueObjectRegister::GetClangAST ()
{
    Process *process = m_reg_ctx_sp->CalculateProcess ();
    if (process)
    {
        Module *exe_module = process->GetTarget().GetExecutableModulePointer();
        if (exe_module)
            return exe_module->GetClangASTContext().getASTContext();
    }
    return NULL;
}

bool
ClangFunction::WriteFunctionWrapper (ExecutionContext &exe_ctx, Stream &errors)
{
    Process *process = exe_ctx.GetProcessPtr();

    if (!process)
        return false;
    
    lldb::ProcessSP jit_process_sp(m_jit_process_wp.lock());
    
    if (process != jit_process_sp.get())
        return false;
    
    if (!m_compiled)
        return false;

    if (m_JITted)
        return true;
        
    bool can_interpret = false; // should stay that way
    
    Error jit_error (m_parser->PrepareForExecution (m_jit_start_addr,
                                                    m_jit_end_addr,
                                                    m_execution_unit_sp,
                                                    exe_ctx, 
                                                    can_interpret,
                                                    eExecutionPolicyAlways));
    
    if (!jit_error.Success())
        return false;
    
    if (m_parser->GetGenerateDebugInfo())
    {
        lldb::ModuleSP jit_module_sp ( m_execution_unit_sp->GetJITModule());
        
        if (jit_module_sp)
        {
            ConstString const_func_name(FunctionName());
            FileSpec jit_file;
            jit_file.GetFilename() = const_func_name;
            jit_module_sp->SetFileSpecAndObjectName (jit_file, ConstString());
            m_jit_module_wp = jit_module_sp;
            process->GetTarget().GetImages().Append(jit_module_sp);
        }
    }
    if (process && m_jit_start_addr)
        m_jit_process_wp = process->shared_from_this();
    
    m_JITted = true;

    return true;
}

lldb::ModuleSP
AppleObjCRuntime::GetObjCModule ()
{
    ModuleSP module_sp (m_objc_module_wp.lock());
    if (module_sp)
        return module_sp;

    Process *process = GetProcess();
    if (process)
    {
        const ModuleList& modules = process->GetTarget().GetImages();
        for (uint32_t idx = 0; idx < modules.GetSize(); idx++)
        {
            module_sp = modules.GetModuleAtIndex(idx);
            if (AppleObjCRuntime::AppleIsModuleObjCLibrary(module_sp))
            {
                m_objc_module_wp = module_sp;
                return module_sp;
            }
        }
    }
    return ModuleSP();
}

Error
Value::GetValueAsData (ExecutionContext *exe_ctx,
                       DataExtractor &data,
                       uint32_t data_offset,
                       Module *module)
{
    data.Clear();

    Error error;
    lldb::addr_t address = LLDB_INVALID_ADDRESS;
    AddressType address_type = eAddressTypeFile;
    Address file_so_addr;
    const CompilerType &ast_type = GetCompilerType();
    switch (m_value_type)
    {
    case eValueTypeVector:
        if (ast_type.IsValid())
            data.SetAddressByteSize (ast_type.GetPointerByteSize());
        else
            data.SetAddressByteSize(sizeof(void *));
        data.SetData(m_vector.bytes, m_vector.length, m_vector.byte_order);
        break;

    case eValueTypeScalar:
        {
            data.SetByteOrder (endian::InlHostByteOrder());
            if (ast_type.IsValid())
                data.SetAddressByteSize (ast_type.GetPointerByteSize());
            else
                data.SetAddressByteSize(sizeof(void *));

            uint32_t limit_byte_size = UINT32_MAX;
            
            if (ast_type.IsValid() && ast_type.IsScalarType())
            {
                uint64_t type_encoding_count = 0;
                lldb::Encoding type_encoding = ast_type.GetEncoding(type_encoding_count);
                
                if (type_encoding == eEncodingUint || type_encoding == eEncodingSint)
                    limit_byte_size = ast_type.GetByteSize(exe_ctx ? exe_ctx->GetBestExecutionContextScope() : nullptr);
            }
            
            if (m_value.GetData (data, limit_byte_size))
                return error;   // Success;
            
            error.SetErrorStringWithFormat("extracting data from value failed");
            break;
        }
    case eValueTypeLoadAddress:
        if (exe_ctx == NULL)
        {
            error.SetErrorString ("can't read load address (no execution context)");
        }
        else 
        {
            Process *process = exe_ctx->GetProcessPtr();
            if (process == NULL || !process->IsAlive())
            {
                Target *target = exe_ctx->GetTargetPtr();
                if (target)
                {
                    // Allow expressions to run and evaluate things when the target
                    // has memory sections loaded. This allows you to use "target modules load"
                    // to load your executable and any shared libraries, then execute
                    // commands where you can look at types in data sections.
                    const SectionLoadList &target_sections = target->GetSectionLoadList();
                    if (!target_sections.IsEmpty())
                    {
                        address = m_value.ULongLong(LLDB_INVALID_ADDRESS);
                        if (target_sections.ResolveLoadAddress(address, file_so_addr))
                        {
                            address_type = eAddressTypeLoad;
                            data.SetByteOrder(target->GetArchitecture().GetByteOrder());
                            data.SetAddressByteSize(target->GetArchitecture().GetAddressByteSize());
                        }
                        else
                            address = LLDB_INVALID_ADDRESS;
                    }
//                    else
//                    {
//                        ModuleSP exe_module_sp (target->GetExecutableModule());
//                        if (exe_module_sp)
//                        {
//                            address = m_value.ULongLong(LLDB_INVALID_ADDRESS);
//                            if (address != LLDB_INVALID_ADDRESS)
//                            {
//                                if (exe_module_sp->ResolveFileAddress(address, file_so_addr))
//                                {
//                                    data.SetByteOrder(target->GetArchitecture().GetByteOrder());
//                                    data.SetAddressByteSize(target->GetArchitecture().GetAddressByteSize());
//                                    address_type = eAddressTypeFile;
//                                }
//                                else
//                                {
//                                    address = LLDB_INVALID_ADDRESS;
//                                }
//                            }
//                        }
//                    }
                }
//.........这里部分代码省略.........

lldb::ExpressionResults
ClangUserExpression::Evaluate (ExecutionContext &exe_ctx,
                               const EvaluateExpressionOptions& options,
                               const char *expr_cstr,
                               const char *expr_prefix,
                               lldb::ValueObjectSP &result_valobj_sp,
                               Error &error)
{
    Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_EXPRESSIONS | LIBLLDB_LOG_STEP));

    lldb_private::ExecutionPolicy execution_policy = options.GetExecutionPolicy();
    const lldb::LanguageType language = options.GetLanguage();
    const ResultType desired_type = options.DoesCoerceToId() ? ClangUserExpression::eResultTypeId : ClangUserExpression::eResultTypeAny;
    lldb::ExpressionResults execution_results = lldb::eExpressionSetupError;

    Process *process = exe_ctx.GetProcessPtr();

    if (process == NULL || process->GetState() != lldb::eStateStopped)
    {
        if (execution_policy == eExecutionPolicyAlways)
        {
            if (log)
                log->Printf("== [ClangUserExpression::Evaluate] Expression may not run, but is not constant ==");

            error.SetErrorString ("expression needed to run but couldn't");

            return execution_results;
        }
    }

    if (process == NULL || !process->CanJIT())
        execution_policy = eExecutionPolicyNever;

    ClangUserExpressionSP user_expression_sp (new ClangUserExpression (expr_cstr, expr_prefix, language, desired_type));

    StreamString error_stream;

    if (log)
        log->Printf("== [ClangUserExpression::Evaluate] Parsing expression %s ==", expr_cstr);

    const bool keep_expression_in_memory = true;
    const bool generate_debug_info = options.GetGenerateDebugInfo();

    if (options.InvokeCancelCallback (lldb::eExpressionEvaluationParse))
    {
        error.SetErrorString ("expression interrupted by callback before parse");
        result_valobj_sp = ValueObjectConstResult::Create (exe_ctx.GetBestExecutionContextScope(), error);
        return lldb::eExpressionInterrupted;
    }

    if (!user_expression_sp->Parse (error_stream,
                                    exe_ctx,
                                    execution_policy,
                                    keep_expression_in_memory,
                                    generate_debug_info))
    {
        if (error_stream.GetString().empty())
            error.SetExpressionError (lldb::eExpressionParseError, "expression failed to parse, unknown error");
        else
            error.SetExpressionError (lldb::eExpressionParseError, error_stream.GetString().c_str());
    }
    else
    {
        lldb::ClangExpressionVariableSP expr_result;

        if (execution_policy == eExecutionPolicyNever &&
            !user_expression_sp->CanInterpret())
        {
            if (log)
                log->Printf("== [ClangUserExpression::Evaluate] Expression may not run, but is not constant ==");

            if (error_stream.GetString().empty())
                error.SetExpressionError (lldb::eExpressionSetupError, "expression needed to run but couldn't");
        }
        else
        {
            if (options.InvokeCancelCallback (lldb::eExpressionEvaluationExecution))
            {
                error.SetExpressionError (lldb::eExpressionInterrupted, "expression interrupted by callback before execution");
                result_valobj_sp = ValueObjectConstResult::Create (exe_ctx.GetBestExecutionContextScope(), error);
                return lldb::eExpressionInterrupted;
            }

            error_stream.GetString().clear();

            if (log)
                log->Printf("== [ClangUserExpression::Evaluate] Executing expression ==");

            execution_results = user_expression_sp->Execute (error_stream,
                                                             exe_ctx,
                                                             options,
                                                             user_expression_sp,
                                                             expr_result);

            if (options.GetResultIsInternal())
            {
                process->GetTarget().GetPersistentVariables().RemovePersistentVariable (expr_result);
            }

            if (execution_results != lldb::eExpressionCompleted)
//.........这里部分代码省略.........

bool ItaniumABILanguageRuntime::GetDynamicTypeAndAddress(
    ValueObject &in_value, lldb::DynamicValueType use_dynamic,
    TypeAndOrName &class_type_or_name, Address &dynamic_address,
    Value::ValueType &value_type) {
  // For Itanium, if the type has a vtable pointer in the object, it will be at
  // offset 0
  // in the object.  That will point to the "address point" within the vtable
  // (not the beginning of the
  // vtable.)  We can then look up the symbol containing this "address point"
  // and that symbol's name
  // demangled will contain the full class name.
  // The second pointer above the "address point" is the "offset_to_top".  We'll
  // use that to get the
  // start of the value object which holds the dynamic type.
  //

  class_type_or_name.Clear();
  value_type = Value::ValueType::eValueTypeScalar;

  // Only a pointer or reference type can have a different dynamic and static
  // type:
  if (CouldHaveDynamicValue(in_value)) {
    // First job, pull out the address at 0 offset from the object.
    AddressType address_type;
    lldb::addr_t original_ptr = in_value.GetPointerValue(&address_type);
    if (original_ptr == LLDB_INVALID_ADDRESS)
      return false;

    ExecutionContext exe_ctx(in_value.GetExecutionContextRef());

    Process *process = exe_ctx.GetProcessPtr();

    if (process == nullptr)
      return false;

    Error error;
    const lldb::addr_t vtable_address_point =
        process->ReadPointerFromMemory(original_ptr, error);

    if (!error.Success() || vtable_address_point == LLDB_INVALID_ADDRESS) {
      return false;
    }

    class_type_or_name = GetTypeInfoFromVTableAddress(in_value, original_ptr,
                                                      vtable_address_point);

    if (class_type_or_name) {
      TypeSP type_sp = class_type_or_name.GetTypeSP();
      // There can only be one type with a given name,
      // so we've just found duplicate definitions, and this
      // one will do as well as any other.
      // We don't consider something to have a dynamic type if
      // it is the same as the static type.  So compare against
      // the value we were handed.
      if (type_sp) {
        if (ClangASTContext::AreTypesSame(in_value.GetCompilerType(),
                                          type_sp->GetForwardCompilerType())) {
          // The dynamic type we found was the same type,
          // so we don't have a dynamic type here...
          return false;
        }

        // The offset_to_top is two pointers above the vtable pointer.
        const uint32_t addr_byte_size = process->GetAddressByteSize();
        const lldb::addr_t offset_to_top_location =
            vtable_address_point - 2 * addr_byte_size;
        // Watch for underflow, offset_to_top_location should be less than
        // vtable_address_point
        if (offset_to_top_location >= vtable_address_point)
          return false;
        const int64_t offset_to_top = process->ReadSignedIntegerFromMemory(
            offset_to_top_location, addr_byte_size, INT64_MIN, error);

        if (offset_to_top == INT64_MIN)
          return false;
        // So the dynamic type is a value that starts at offset_to_top
        // above the original address.
        lldb::addr_t dynamic_addr = original_ptr + offset_to_top;
        if (!process->GetTarget().GetSectionLoadList().ResolveLoadAddress(
                dynamic_addr, dynamic_address)) {
          dynamic_address.SetRawAddress(dynamic_addr);
        }
        return true;
      }
    }
  }

  return class_type_or_name.IsEmpty() == false;
}

lldb::addr_t
AppleObjCRuntimeV1::GetISAHashTablePointer ()
{
    if (m_isa_hash_table_ptr == LLDB_INVALID_ADDRESS)
    {
        ModuleSP objc_module_sp(GetObjCModule());
        
        if (!objc_module_sp)
            return LLDB_INVALID_ADDRESS;
        
        static ConstString g_objc_debug_class_hash("_objc_debug_class_hash");
        
        const Symbol *symbol = objc_module_sp->FindFirstSymbolWithNameAndType(g_objc_debug_class_hash, lldb::eSymbolTypeData);
        if (symbol && symbol->ValueIsAddress())
        {
            Process *process = GetProcess();
            if (process)
            {

                lldb::addr_t objc_debug_class_hash_addr = symbol->GetAddressRef().GetLoadAddress(&process->GetTarget());
            
                if (objc_debug_class_hash_addr != LLDB_INVALID_ADDRESS)
                {
                    Error error;
                    lldb::addr_t objc_debug_class_hash_ptr = process->ReadPointerFromMemory(objc_debug_class_hash_addr, error);
                    if (objc_debug_class_hash_ptr != 0 &&
                        objc_debug_class_hash_ptr != LLDB_INVALID_ADDRESS)
                    {
                        m_isa_hash_table_ptr = objc_debug_class_hash_ptr;
                    }
                }
            }
        }
    }
    return m_isa_hash_table_ptr;
}

    virtual bool
    Execute (Args& command,
             CommandReturnObject &result)
    {
        Process *process = m_interpreter.GetDebugger().GetExecutionContext().process;
        if (process == NULL)
        {
            result.AppendError("need a process to read memory");
            result.SetStatus(eReturnStatusFailed);
            return false;
        }

        const size_t argc = command.GetArgumentCount();

        if (m_options.m_infile)
        {
            if (argc < 1)
            {
                result.AppendErrorWithFormat ("%s takes a destination address when writing file contents.\n", m_cmd_name.c_str());
                result.SetStatus(eReturnStatusFailed);
                return false;
            }       
        }
        else if (argc < 2)
        {
            result.AppendErrorWithFormat ("%s takes a destination address and at least one value.\n", m_cmd_name.c_str());
            result.SetStatus(eReturnStatusFailed);
            return false;
        }

        StreamString buffer (Stream::eBinary,
                             process->GetTarget().GetArchitecture().GetAddressByteSize(),
                             process->GetTarget().GetArchitecture().GetByteOrder());

        size_t item_byte_size = m_options.m_byte_size;

        lldb::addr_t addr = Args::StringToUInt64(command.GetArgumentAtIndex(0), LLDB_INVALID_ADDRESS, 0);

        if (addr == LLDB_INVALID_ADDRESS)
        {
            result.AppendErrorWithFormat("Invalid address string '%s'.\n", command.GetArgumentAtIndex(0));
            result.SetStatus(eReturnStatusFailed);
            return false;
        }
        
        if (m_options.m_infile)
        {
            size_t length = SIZE_MAX;
            if (m_options.m_byte_size > 0)
                length = m_options.m_byte_size;
            lldb::DataBufferSP data_sp (m_options.m_infile.ReadFileContents (m_options.m_infile_offset, length));
            if (data_sp)
            {
                length = data_sp->GetByteSize();
                if (length > 0)
                {
                    Error error;
                    size_t bytes_written = process->WriteMemory (addr, data_sp->GetBytes(), length, error);
                    
                    if (bytes_written == length)
                    {
                        // All bytes written
                        result.GetOutputStream().Printf("%zu bytes were written to 0x%llx\n", bytes_written, addr);
                        result.SetStatus(eReturnStatusSuccessFinishResult);
                    }
                    else if (bytes_written > 0)
                    {
                        // Some byte written
                        result.GetOutputStream().Printf("%zu bytes of %zu requested were written to 0x%llx\n", bytes_written, length, addr);
                        result.SetStatus(eReturnStatusSuccessFinishResult);
                    }
                    else 
                    {
                        result.AppendErrorWithFormat ("Memory write to 0x%llx failed: %s.\n", addr, error.AsCString());
                        result.SetStatus(eReturnStatusFailed);
                    }
                }
            }
            else
            {
                result.AppendErrorWithFormat ("Unable to read contents of file.\n");
                result.SetStatus(eReturnStatusFailed);
            }
            return result.Succeeded();
        }
        else if (m_options.m_byte_size == 0)
        {
            if (m_options.m_format == eFormatPointer)
                item_byte_size = buffer.GetAddressByteSize();
            else
                item_byte_size = 1;
        }

        command.Shift(); // shift off the address argument
        uint64_t uval64;
        int64_t sval64;
        bool success = false;
        const uint32_t num_value_args = command.GetArgumentCount();
        uint32_t i;
        for (i=0; i<num_value_args; ++i)
//.........这里部分代码省略.........

Error
Value::GetValueAsData (ExecutionContext *exe_ctx, 
                       clang::ASTContext *ast_context, 
                       DataExtractor &data, 
                       uint32_t data_offset,
                       Module *module)
{
    data.Clear();

    Error error;
    lldb::addr_t address = LLDB_INVALID_ADDRESS;
    AddressType address_type = eAddressTypeFile;
    Address file_so_addr;
    switch (m_value_type)
    {
    default:
        error.SetErrorStringWithFormat("invalid value type %i", m_value_type);
        break;

    case eValueTypeScalar:
        data.SetByteOrder (lldb::endian::InlHostByteOrder());
        if (m_context_type == eContextTypeClangType && ast_context)
        {
            uint32_t ptr_bit_width = ClangASTType::GetClangTypeBitWidth (ast_context, 
                                                                     ClangASTContext::GetVoidPtrType(ast_context, false));
            uint32_t ptr_byte_size = (ptr_bit_width + 7) / 8;
            data.SetAddressByteSize (ptr_byte_size);
        }
        else
            data.SetAddressByteSize(sizeof(void *));
        if (m_value.GetData (data))
            return error;   // Success;
        error.SetErrorStringWithFormat("extracting data from value failed");
        break;

    case eValueTypeLoadAddress:
        if (exe_ctx == NULL)
        {
            error.SetErrorString ("can't read load address (no execution context)");
        }
        else 
        {
            Process *process = exe_ctx->GetProcessPtr();
            if (process == NULL)
            {
                error.SetErrorString ("can't read load address (invalid process)");
            }
            else
            {
                address = m_value.ULongLong(LLDB_INVALID_ADDRESS);
                address_type = eAddressTypeLoad;
                data.SetByteOrder(process->GetTarget().GetArchitecture().GetByteOrder());
                data.SetAddressByteSize(process->GetTarget().GetArchitecture().GetAddressByteSize());
            }
        }
        break;

    case eValueTypeFileAddress:
        if (exe_ctx == NULL)
        {
            error.SetErrorString ("can't read file address (no execution context)");
        }
        else if (exe_ctx->GetTargetPtr() == NULL)
        {
            error.SetErrorString ("can't read file address (invalid target)");
        }
        else
        {
            address = m_value.ULongLong(LLDB_INVALID_ADDRESS);
            if (address == LLDB_INVALID_ADDRESS)
            {
                error.SetErrorString ("invalid file address");
            }
            else
            {
                if (module == NULL)
                {
                    // The only thing we can currently lock down to a module so that
                    // we can resolve a file address, is a variable.
                    Variable *variable = GetVariable();
                    if (variable)
                    {
                        SymbolContext var_sc;
                        variable->CalculateSymbolContext(&var_sc);
                        module = var_sc.module_sp.get();
                    }
                }
                
                if (module)
                {
                    bool resolved = false;
                    ObjectFile *objfile = module->GetObjectFile();
                    if (objfile)
                    {
                        Address so_addr(address, objfile->GetSectionList());
                        addr_t load_address = so_addr.GetLoadAddress (exe_ctx->GetTargetPtr());
                        bool process_launched_and_stopped = exe_ctx->GetProcessPtr()
                            ? StateIsStoppedState(exe_ctx->GetProcessPtr()->GetState(), true /* must_exist */)
                            : false;
                        // Don't use the load address if the process has exited.
//.........这里部分代码省略.........

lldb::ExpressionResults
UserExpression::Evaluate (ExecutionContext &exe_ctx,
                               const EvaluateExpressionOptions& options,
                               const char *expr_cstr,
                               const char *expr_prefix,
                               lldb::ValueObjectSP &result_valobj_sp,
                               Error &error,
                               uint32_t line_offset,
                               lldb::ModuleSP *jit_module_sp_ptr)
{
    Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_EXPRESSIONS | LIBLLDB_LOG_STEP));

    lldb_private::ExecutionPolicy execution_policy = options.GetExecutionPolicy();
    lldb::LanguageType language = options.GetLanguage();
    const ResultType desired_type = options.DoesCoerceToId() ? UserExpression::eResultTypeId : UserExpression::eResultTypeAny;
    lldb::ExpressionResults execution_results = lldb::eExpressionSetupError;
    
    Target *target = exe_ctx.GetTargetPtr();
    if (!target)
    {
        if (log)
            log->Printf("== [UserExpression::Evaluate] Passed a NULL target, can't run expressions.");
        return lldb::eExpressionSetupError;
    }

    Process *process = exe_ctx.GetProcessPtr();

    if (process == NULL || process->GetState() != lldb::eStateStopped)
    {
        if (execution_policy == eExecutionPolicyAlways)
        {
            if (log)
                log->Printf("== [UserExpression::Evaluate] Expression may not run, but is not constant ==");

            error.SetErrorString ("expression needed to run but couldn't");

            return execution_results;
        }
    }

    if (process == NULL || !process->CanJIT())
        execution_policy = eExecutionPolicyNever;

    const char *full_prefix = NULL;
    const char *option_prefix = options.GetPrefix();
    std::string full_prefix_storage;
    if (expr_prefix && option_prefix)
    {
        full_prefix_storage.assign(expr_prefix);
        full_prefix_storage.append(option_prefix);
        if (!full_prefix_storage.empty())
            full_prefix = full_prefix_storage.c_str();
    }
    else if (expr_prefix)
        full_prefix = expr_prefix;
    else
        full_prefix = option_prefix;
    
    // If the language was not specified in the expression command,
    // set it to the language in the target's properties if
    // specified, else default to the langage for the frame.
    if (language == lldb::eLanguageTypeUnknown)
    {
        if (target->GetLanguage() != lldb::eLanguageTypeUnknown)
            language = target->GetLanguage();
        else if (StackFrame *frame = exe_ctx.GetFramePtr())
            language = frame->GetLanguage();
    }


    // If the language was not specified in the expression command,
    // set it to the language in the target's properties if
    // specified, else default to the langage for the frame.
    if (language == lldb::eLanguageTypeUnknown)
    {
        if (target->GetLanguage() != lldb::eLanguageTypeUnknown)
            language = target->GetLanguage();
        else if (StackFrame *frame = exe_ctx.GetFramePtr())
            language = frame->GetLanguage();
    }

    lldb::UserExpressionSP user_expression_sp(target->GetUserExpressionForLanguage (expr_cstr,
                                                                                    full_prefix,
                                                                                    language,
                                                                                    desired_type,
                                                                                    options,
                                                                                    error));
    if (error.Fail())
    {
        if (log)
            log->Printf ("== [UserExpression::Evaluate] Getting expression: %s ==", error.AsCString());
        return lldb::eExpressionSetupError;
    }
 
    StreamString error_stream;

    if (log)
        log->Printf("== [UserExpression::Evaluate] Parsing expression %s ==", expr_cstr);

    const bool keep_expression_in_memory = true;
//.........这里部分代码省略.........

// Static callback function that gets called when our DYLD notification
// breakpoint gets hit. We update all of our image infos and then let our super
// class DynamicLoader class decide if we should stop or not (based on global
// preference).
bool DynamicLoaderMacOSXDYLD::NotifyBreakpointHit(
    void *baton, StoppointCallbackContext *context, lldb::user_id_t break_id,
    lldb::user_id_t break_loc_id) {
  // Let the event know that the images have changed
  // DYLD passes three arguments to the notification breakpoint.
  // Arg1: enum dyld_image_mode mode - 0 = adding, 1 = removing Arg2: uint32_t
  // infoCount        - Number of shared libraries added Arg3: dyld_image_info
  // info[]    - Array of structs of the form:
  //                                     const struct mach_header
  //                                     *imageLoadAddress
  //                                     const char               *imageFilePath
  //                                     uintptr_t imageFileModDate (a time_t)

  DynamicLoaderMacOSXDYLD *dyld_instance = (DynamicLoaderMacOSXDYLD *)baton;

  // First step is to see if we've already initialized the all image infos.  If
  // we haven't then this function will do so and return true.  In the course
  // of initializing the all_image_infos it will read the complete current
  // state, so we don't need to figure out what has changed from the data
  // passed in to us.

  ExecutionContext exe_ctx(context->exe_ctx_ref);
  Process *process = exe_ctx.GetProcessPtr();

  // This is a sanity check just in case this dyld_instance is an old dyld
  // plugin's breakpoint still lying around.
  if (process != dyld_instance->m_process)
    return false;

  if (dyld_instance->InitializeFromAllImageInfos())
    return dyld_instance->GetStopWhenImagesChange();

  const lldb::ABISP &abi = process->GetABI();
  if (abi) {
    // Build up the value array to store the three arguments given above, then
    // get the values from the ABI:

    ClangASTContext *clang_ast_context =
        process->GetTarget().GetScratchClangASTContext();
    ValueList argument_values;
    Value input_value;

    CompilerType clang_void_ptr_type =
        clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType();
    CompilerType clang_uint32_type =
        clang_ast_context->GetBuiltinTypeForEncodingAndBitSize(
            lldb::eEncodingUint, 32);
    input_value.SetValueType(Value::eValueTypeScalar);
    input_value.SetCompilerType(clang_uint32_type);
    //        input_value.SetContext (Value::eContextTypeClangType,
    //        clang_uint32_type);
    argument_values.PushValue(input_value);
    argument_values.PushValue(input_value);
    input_value.SetCompilerType(clang_void_ptr_type);
    //        input_value.SetContext (Value::eContextTypeClangType,
    //        clang_void_ptr_type);
    argument_values.PushValue(input_value);

    if (abi->GetArgumentValues(exe_ctx.GetThreadRef(), argument_values)) {
      uint32_t dyld_mode =
          argument_values.GetValueAtIndex(0)->GetScalar().UInt(-1);
      if (dyld_mode != static_cast<uint32_t>(-1)) {
        // Okay the mode was right, now get the number of elements, and the
        // array of new elements...
        uint32_t image_infos_count =
            argument_values.GetValueAtIndex(1)->GetScalar().UInt(-1);
        if (image_infos_count != static_cast<uint32_t>(-1)) {
          // Got the number added, now go through the array of added elements,
          // putting out the mach header address, and adding the image. Note,
          // I'm not putting in logging here, since the AddModules &
          // RemoveModules functions do all the logging internally.

          lldb::addr_t image_infos_addr =
              argument_values.GetValueAtIndex(2)->GetScalar().ULongLong();
          if (dyld_mode == 0) {
            // This is add:
            dyld_instance->AddModulesUsingImageInfosAddress(image_infos_addr,
                                                            image_infos_count);
          } else {
            // This is remove:
            dyld_instance->RemoveModulesUsingImageInfosAddress(
                image_infos_addr, image_infos_count);
          }
        }
      }
    }
  } else {
    process->GetTarget().GetDebugger().GetAsyncErrorStream()->Printf(
        "No ABI plugin located for triple %s -- shared libraries will not be "
        "registered!\n",
        process->GetTarget().GetArchitecture().GetTriple().getTriple().c_str());
  }

  // Return true to stop the target, false to just let the target run
  return dyld_instance->GetStopWhenImagesChange();
}

CPPLanguageRuntime::LibCppStdFunctionCallableInfo
CPPLanguageRuntime::FindLibCppStdFunctionCallableInfo(
    lldb::ValueObjectSP &valobj_sp) {
  LibCppStdFunctionCallableInfo optional_info;

  if (!valobj_sp)
    return optional_info;

  // Member __f_ has type __base*, the contents of which will hold:
  // 1) a vtable entry which may hold type information needed to discover the
  //    lambda being called
  // 2) possibly hold a pointer to the callable object
  // e.g.
  //
  // (lldb) frame var -R  f_display
  // (std::__1::function<void (int)>) f_display = {
  //  __buf_ = {
  //  …
  // }
  //  __f_ = 0x00007ffeefbffa00
  // }
  // (lldb) memory read -fA 0x00007ffeefbffa00
  // 0x7ffeefbffa00: ... `vtable for std::__1::__function::__func<void (*) ...
  // 0x7ffeefbffa08: ... `print_num(int) at std_function_cppreference_exam ...
  //
  // We will be handling five cases below, std::function is wrapping:
  //
  // 1) a lambda we know at compile time. We will obtain the name of the lambda
  //    from the first template pameter from __func's vtable. We will look up
  //    the lambda's operator()() and obtain the line table entry.
  // 2) a lambda we know at runtime. A pointer to the lambdas __invoke method
  //    will be stored after the vtable. We will obtain the lambdas name from
  //    this entry and lookup operator()() and obtain the line table entry.
  // 3) a callable object via operator()(). We will obtain the name of the
  //    object from the first template parameter from __func's vtable. We will
  //    look up the objectc operator()() and obtain the line table entry.
  // 4) a member function. A pointer to the function will stored after the
  //    we will obtain the name from this pointer.
  // 5) a free function. A pointer to the function will stored after the vtable
  //    we will obtain the name from this pointer.
  ValueObjectSP member__f_(
      valobj_sp->GetChildMemberWithName(ConstString("__f_"), true));

  if (member__f_) {
    ValueObjectSP sub_member__f_(
       member__f_->GetChildMemberWithName(ConstString("__f_"), true));

    if (sub_member__f_)
        member__f_ = sub_member__f_;
  }

  lldb::addr_t member__f_pointer_value = member__f_->GetValueAsUnsigned(0);

  optional_info.member__f_pointer_value = member__f_pointer_value;

  ExecutionContext exe_ctx(valobj_sp->GetExecutionContextRef());
  Process *process = exe_ctx.GetProcessPtr();

  if (process == nullptr)
    return optional_info;

  uint32_t address_size = process->GetAddressByteSize();
  Status status;

  // First item pointed to by __f_ should be the pointer to the vtable for
  // a __base object.
  lldb::addr_t vtable_address =
      process->ReadPointerFromMemory(member__f_pointer_value, status);

  if (status.Fail())
    return optional_info;

  lldb::addr_t address_after_vtable = member__f_pointer_value + address_size;
  // As commened above we may not have a function pointer but if we do we will
  // need it.
  lldb::addr_t possible_function_address =
      process->ReadPointerFromMemory(address_after_vtable, status);

  if (status.Fail())
    return optional_info;

  Target &target = process->GetTarget();

  if (target.GetSectionLoadList().IsEmpty())
    return optional_info;

  Address vtable_addr_resolved;
  SymbolContext sc;
  Symbol *symbol;

  if (!target.GetSectionLoadList().ResolveLoadAddress(vtable_address,
                                                      vtable_addr_resolved))
    return optional_info;

  target.GetImages().ResolveSymbolContextForAddress(
      vtable_addr_resolved, eSymbolContextEverything, sc);
  symbol = sc.symbol;

  if (symbol == nullptr)
    return optional_info;
//.........这里部分代码省略.........