C++ EvaluateExpressionOptions::SetResultIsInternal方法代码示例

bool
lldb_private::formatters::CFBagSummaryProvider (ValueObject& valobj, Stream& stream, const TypeSummaryOptions& options)
{
    static ConstString g_TypeHint("CFBag");
    
    ProcessSP process_sp = valobj.GetProcessSP();
    if (!process_sp)
        return false;
    
    ObjCLanguageRuntime* runtime = (ObjCLanguageRuntime*)process_sp->GetLanguageRuntime(lldb::eLanguageTypeObjC);
    
    if (!runtime)
        return false;
    
    ObjCLanguageRuntime::ClassDescriptorSP descriptor(runtime->GetClassDescriptor(valobj));
    
    if (!descriptor.get() || !descriptor->IsValid())
        return false;
    
    uint32_t ptr_size = process_sp->GetAddressByteSize();
    
    lldb::addr_t valobj_addr = valobj.GetValueAsUnsigned(0);
    
    if (!valobj_addr)
        return false;
    
    uint32_t count = 0;
    
    bool is_type_ok = false; // check to see if this is a CFBag we know about
    if (descriptor->IsCFType())
    {
        ConstString type_name(valobj.GetTypeName());
        if (type_name == ConstString("__CFBag") || type_name == ConstString("const struct __CFBag"))
        {
            if (valobj.IsPointerType())
                is_type_ok = true;
        }
    }
    
    if (is_type_ok == false)
    {
        StackFrameSP frame_sp(valobj.GetFrameSP());
        if (!frame_sp)
            return false;
        ValueObjectSP count_sp;
        StreamString expr;
        expr.Printf("(int)CFBagGetCount((void*)0x%" PRIx64 ")",valobj.GetPointerValue());
        EvaluateExpressionOptions options;
        options.SetResultIsInternal(true);
        if (process_sp->GetTarget().EvaluateExpression(expr.GetData(), frame_sp.get(), count_sp, options) != eExpressionCompleted)
            return false;
        if (!count_sp)
            return false;
        count = count_sp->GetValueAsUnsigned(0);
    }
    else
    {
        uint32_t offset = 2*ptr_size+4 + valobj_addr;
        Error error;
        count = process_sp->ReadUnsignedIntegerFromMemory(offset, 4, 0, error);
        if (error.Fail())
            return false;
    }
    
    std::string prefix,suffix;
    if (Language* language = Language::FindPlugin(options.GetLanguage()))
    {
        if (!language->GetFormatterPrefixSuffix(valobj, g_TypeHint, prefix, suffix))
        {
            prefix.clear();
            suffix.clear();
        }
    }
    
    stream.Printf("%s\"%u value%s\"%s",
                  prefix.c_str(),
                  count,(count == 1 ? "" : "s"),
                  suffix.c_str());
    return true;
}

bool BreakpointLocation::ConditionSaysStop(ExecutionContext &exe_ctx,
                                           Status &error) {
  Log *log = lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_BREAKPOINTS);

  std::lock_guard<std::mutex> guard(m_condition_mutex);

  size_t condition_hash;
  const char *condition_text = GetConditionText(&condition_hash);

  if (!condition_text) {
    m_user_expression_sp.reset();
    return false;
  }

  error.Clear();

  DiagnosticManager diagnostics;

  if (condition_hash != m_condition_hash || !m_user_expression_sp ||
      !m_user_expression_sp->MatchesContext(exe_ctx)) {
    LanguageType language = eLanguageTypeUnknown;
    // See if we can figure out the language from the frame, otherwise use the
    // default language:
    CompileUnit *comp_unit = m_address.CalculateSymbolContextCompileUnit();
    if (comp_unit)
      language = comp_unit->GetLanguage();

    m_user_expression_sp.reset(GetTarget().GetUserExpressionForLanguage(
        condition_text, llvm::StringRef(), language, Expression::eResultTypeAny,
        EvaluateExpressionOptions(), nullptr, error));
    if (error.Fail()) {
      if (log)
        log->Printf("Error getting condition expression: %s.",
                    error.AsCString());
      m_user_expression_sp.reset();
      return true;
    }

    if (!m_user_expression_sp->Parse(diagnostics, exe_ctx,
                                     eExecutionPolicyOnlyWhenNeeded, true,
                                     false)) {
      error.SetErrorStringWithFormat(
          "Couldn't parse conditional expression:\n%s",
          diagnostics.GetString().c_str());
      m_user_expression_sp.reset();
      return true;
    }

    m_condition_hash = condition_hash;
  }

  // We need to make sure the user sees any parse errors in their condition, so
  // we'll hook the constructor errors up to the debugger's Async I/O.

  ValueObjectSP result_value_sp;

  EvaluateExpressionOptions options;
  options.SetUnwindOnError(true);
  options.SetIgnoreBreakpoints(true);
  options.SetTryAllThreads(true);
  options.SetResultIsInternal(
      true); // Don't generate a user variable for condition expressions.

  Status expr_error;

  diagnostics.Clear();

  ExpressionVariableSP result_variable_sp;

  ExpressionResults result_code = m_user_expression_sp->Execute(
      diagnostics, exe_ctx, options, m_user_expression_sp, result_variable_sp);

  bool ret;

  if (result_code == eExpressionCompleted) {
    if (!result_variable_sp) {
      error.SetErrorString("Expression did not return a result");
      return false;
    }

    result_value_sp = result_variable_sp->GetValueObject();

    if (result_value_sp) {
      ret = result_value_sp->IsLogicalTrue(error);
      if (log) {
        if (error.Success()) {
          log->Printf("Condition successfully evaluated, result is %s.\n",
                      ret ? "true" : "false");
        } else {
          error.SetErrorString(
              "Failed to get an integer result from the expression");
          ret = false;
        }
      }
    } else {
      ret = false;
      error.SetErrorString("Failed to get any result from the expression");
    }
  } else {
    ret = false;
//.........这里部分代码省略.........