C++ EvaluateExpressionOptions类代码示例

lldb::ValueObjectSP
lldb_private::formatters::CallSelectorOnObject (ValueObject &valobj,
                                                const char* return_type,
                                                const char* selector,
                                                uint64_t index)
{
    lldb::ValueObjectSP valobj_sp;
    if (!return_type || !*return_type)
        return valobj_sp;
    if (!selector || !*selector)
        return valobj_sp;
    StreamString expr_path_stream;
    valobj.GetExpressionPath(expr_path_stream, false);
    StreamString expr;
    expr.Printf("(%s)[%s %s:%" PRId64 "]",return_type,expr_path_stream.GetData(),selector,index);
    ExecutionContext exe_ctx (valobj.GetExecutionContextRef());
    lldb::ValueObjectSP result_sp;
    Target* target = exe_ctx.GetTargetPtr();
    StackFrame* stack_frame = exe_ctx.GetFramePtr();
    if (!target || !stack_frame)
        return valobj_sp;
    
    EvaluateExpressionOptions options;
    options.SetCoerceToId(false)
    .SetUnwindOnError(true)
    .SetKeepInMemory(true)
    .SetUseDynamic(lldb::eDynamicCanRunTarget);
    
    target->EvaluateExpression(expr.GetData(),
                               stack_frame,
                               valobj_sp,
                               options);
    return valobj_sp;
}

lldb::ExpressionResults
GoUserExpression::DoExecute(DiagnosticManager &diagnostic_manager,
                            ExecutionContext &exe_ctx,
                            const EvaluateExpressionOptions &options,
                            lldb::UserExpressionSP &shared_ptr_to_me,
                            lldb::ExpressionVariableSP &result) {
  Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_EXPRESSIONS |
                                                  LIBLLDB_LOG_STEP));

  lldb_private::ExecutionPolicy execution_policy = options.GetExecutionPolicy();
  lldb::ExpressionResults execution_results = lldb::eExpressionSetupError;

  Process *process = exe_ctx.GetProcessPtr();
  Target *target = exe_ctx.GetTargetPtr();

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

      diagnostic_manager.PutCString(eDiagnosticSeverityError,
                                    "expression needed to run but couldn't");

      return execution_results;
    }
  }

  m_interpreter->set_use_dynamic(options.GetUseDynamic());
  ValueObjectSP result_val_sp = m_interpreter->Evaluate(exe_ctx);
  Error err = m_interpreter->error();
  m_interpreter.reset();

  if (!result_val_sp) {
    const char *error_cstr = err.AsCString();
    if (error_cstr && error_cstr[0])
      diagnostic_manager.PutCString(eDiagnosticSeverityError, error_cstr);
    else
      diagnostic_manager.PutCString(eDiagnosticSeverityError,
                                    "expression can't be interpreted or run");
    return lldb::eExpressionDiscarded;
  }
  result.reset(new ExpressionVariable(ExpressionVariable::eKindGo));
  result->m_live_sp = result->m_frozen_sp = result_val_sp;
  result->m_flags |= ExpressionVariable::EVIsProgramReference;
  PersistentExpressionState *pv =
      target->GetPersistentExpressionStateForLanguage(eLanguageTypeGo);
  if (pv != nullptr) {
    result->SetName(pv->GetNextPersistentVariableName());
    pv->AddVariable(result);
  }
  return lldb::eExpressionCompleted;
}

ThreadPlanCallFunction::ThreadPlanCallFunction(Thread &thread,
                                               const Address &function,
                                               const EvaluateExpressionOptions &options) :
    ThreadPlan(ThreadPlan::eKindCallFunction, "Call function plan", thread, eVoteNoOpinion, eVoteNoOpinion),
    m_valid(false),
    m_stop_other_threads(options.GetStopOthers()),
    m_unwind_on_error(options.DoesUnwindOnError()),
    m_ignore_breakpoints(options.DoesIgnoreBreakpoints()),
    m_debug_execution(options.GetDebug()),
    m_trap_exceptions(options.GetTrapExceptions()),
    m_function_addr(function),
    m_function_sp(0),
    m_takedown_done(false),
    m_should_clear_objc_exception_bp(false),
    m_should_clear_cxx_exception_bp(false),
    m_stop_address(LLDB_INVALID_ADDRESS),
    m_return_type(CompilerType())
{
}

lldb::ValueObjectSP
lldb_private::formatters::NSDictionaryCodeRunningSyntheticFrontEnd::GetChildAtIndex (size_t idx)
{
    StreamString idx_name;
    idx_name.Printf("[%zu]",idx);
    StreamString key_fetcher_expr;
    key_fetcher_expr.Printf("(id)[(NSArray*)[(id)0x%" PRIx64 " allKeys] objectAtIndex:%zu]",m_backend.GetPointerValue(),idx);
    StreamString value_fetcher_expr;
    value_fetcher_expr.Printf("(id)[(id)0x%" PRIx64 " objectForKey:(%s)]",m_backend.GetPointerValue(),key_fetcher_expr.GetData());
    StreamString object_fetcher_expr;
    object_fetcher_expr.Printf("struct __lldb_autogen_nspair { id key; id value; } _lldb_valgen_item; _lldb_valgen_item.key = %s; _lldb_valgen_item.value = %s; _lldb_valgen_item;",key_fetcher_expr.GetData(),value_fetcher_expr.GetData());
    lldb::ValueObjectSP child_sp;
    EvaluateExpressionOptions options;
    options.SetKeepInMemory(true);
    m_backend.GetTargetSP()->EvaluateExpression(object_fetcher_expr.GetData(), m_backend.GetFrameSP().get(), child_sp,
                                                options);
    if (child_sp)
        child_sp->SetName(ConstString(idx_name.GetData()));
    return child_sp;
}

ThreadPlanCallFunction::ThreadPlanCallFunction (Thread &thread,
        const Address &function,
        const ClangASTType &return_type,
        llvm::ArrayRef<addr_t> args,
        const EvaluateExpressionOptions &options) :
    ThreadPlan (ThreadPlan::eKindCallFunction, "Call function plan", thread, eVoteNoOpinion, eVoteNoOpinion),
    m_valid (false),
    m_stop_other_threads (options.GetStopOthers()),
    m_unwind_on_error (options.DoesUnwindOnError()),
    m_ignore_breakpoints (options.DoesIgnoreBreakpoints()),
    m_debug_execution (options.GetDebug()),
    m_trap_exceptions (options.GetTrapExceptions()),
    m_function_addr (function),
    m_function_sp (0),
    m_takedown_done (false),
    m_should_clear_objc_exception_bp(false),
    m_should_clear_cxx_exception_bp (false),
    m_stop_address (LLDB_INVALID_ADDRESS),
    m_return_type (return_type)
{
    lldb::addr_t start_load_addr = LLDB_INVALID_ADDRESS;
    lldb::addr_t function_load_addr = LLDB_INVALID_ADDRESS;
    ABI *abi = nullptr;

    if (!ConstructorSetup (thread, abi, start_load_addr, function_load_addr))
        return;

    if (!abi->PrepareTrivialCall(thread,
                                 m_function_sp,
                                 function_load_addr,
                                 start_load_addr,
                                 args))
        return;

    ReportRegisterState ("Function call was set up.  Register state was:");

    m_valid = true;
}

lldb::ExpressionResults
UserExpression::Execute(DiagnosticManager &diagnostic_manager,
                        ExecutionContext &exe_ctx,
                        const EvaluateExpressionOptions &options,
                        lldb::UserExpressionSP &shared_ptr_to_me,
                        lldb::ExpressionVariableSP &result_var)
{
    lldb::ExpressionResults expr_result = DoExecute(diagnostic_manager, exe_ctx, options, shared_ptr_to_me, result_var);
    Target *target = exe_ctx.GetTargetPtr();
    if (options.GetResultIsInternal() && result_var && target)
    {
        target->GetPersistentExpressionStateForLanguage(m_language)->RemovePersistentVariable (result_var);
    }
    return expr_result;
}

ClangUserExpression::ClangUserExpression(
    ExecutionContextScope &exe_scope, llvm::StringRef expr,
    llvm::StringRef prefix, lldb::LanguageType language,
    ResultType desired_type, const EvaluateExpressionOptions &options)
    : LLVMUserExpression(exe_scope, expr, prefix, language, desired_type,
                         options),
      m_type_system_helper(*m_target_wp.lock().get(),
                           options.GetExecutionPolicy() ==
                               eExecutionPolicyTopLevel),
      m_result_delegate(exe_scope.CalculateTarget()) {
  switch (m_language) {
  case lldb::eLanguageTypeC_plus_plus:
    m_allow_cxx = true;
    break;
  case lldb::eLanguageTypeObjC:
    m_allow_objc = true;
    break;
  case lldb::eLanguageTypeObjC_plus_plus:
  default:
    m_allow_cxx = true;
    m_allow_objc = true;
    break;
  }
}

bool
AppleObjCRuntime::GetObjectDescription (Stream &strm, Value &value, ExecutionContextScope *exe_scope)
{
    if (!m_read_objc_library)
        return false;
        
    ExecutionContext exe_ctx;
    exe_scope->CalculateExecutionContext(exe_ctx);
    Process *process = exe_ctx.GetProcessPtr();
    if (!process)
        return false;
    
    // We need other parts of the exe_ctx, but the processes have to match.
    assert (m_process == process);
    
    // Get the function address for the print function.
    const Address *function_address = GetPrintForDebuggerAddr();
    if (!function_address)
        return false;
    
    Target *target = exe_ctx.GetTargetPtr();
    CompilerType compiler_type = value.GetCompilerType();
    if (compiler_type)
    {
        if (!ClangASTContext::IsObjCObjectPointerType(compiler_type))
        {
            strm.Printf ("Value doesn't point to an ObjC object.\n");
            return false;
        }
    }
    else 
    {
        // If it is not a pointer, see if we can make it into a pointer.
        ClangASTContext *ast_context = target->GetScratchClangASTContext();
        CompilerType opaque_type = ast_context->GetBasicType(eBasicTypeObjCID);
        if (!opaque_type)
            opaque_type = ast_context->GetBasicType(eBasicTypeVoid).GetPointerType();
        //value.SetContext(Value::eContextTypeClangType, opaque_type_ptr);
        value.SetCompilerType (opaque_type);
    }

    ValueList arg_value_list;
    arg_value_list.PushValue(value);
    
    // This is the return value:
    ClangASTContext *ast_context = target->GetScratchClangASTContext();
    
    CompilerType return_compiler_type = ast_context->GetCStringType(true);
    Value ret;
//    ret.SetContext(Value::eContextTypeClangType, return_compiler_type);
    ret.SetCompilerType (return_compiler_type);
    
    if (exe_ctx.GetFramePtr() == NULL)
    {
        Thread *thread = exe_ctx.GetThreadPtr();
        if (thread == NULL)
        {
            exe_ctx.SetThreadSP(process->GetThreadList().GetSelectedThread());
            thread = exe_ctx.GetThreadPtr();
        }
        if (thread)
        {
            exe_ctx.SetFrameSP(thread->GetSelectedFrame());
        }
    }
    
    // Now we're ready to call the function:
    
    StreamString error_stream;
    lldb::addr_t wrapper_struct_addr = LLDB_INVALID_ADDRESS;

    if (!m_print_object_caller_up)
    {
        Error error;
         m_print_object_caller_up.reset(exe_scope->CalculateTarget()->GetFunctionCallerForLanguage (eLanguageTypeObjC,
                                                                                                    return_compiler_type,
                                                                                                    *function_address,
                                                                                                    arg_value_list,
                                                                                                    "objc-object-description",
                                                                                                    error));
        if (error.Fail())
        {
            m_print_object_caller_up.reset();
            strm.Printf("Could not get function runner to call print for debugger function: %s.", error.AsCString());
            return false;
        }
        m_print_object_caller_up->InsertFunction(exe_ctx, wrapper_struct_addr, error_stream);
    }
    else
    {
        m_print_object_caller_up->WriteFunctionArguments(exe_ctx,
                                                         wrapper_struct_addr,
                                                         arg_value_list,
                                                         error_stream);
    }

    

    EvaluateExpressionOptions options;
    options.SetUnwindOnError(true);
//.........这里部分代码省略.........

bool
lldb_private::InferiorCallMmap (Process *process,
                                addr_t &allocated_addr,
                                addr_t addr,
                                addr_t length,
                                unsigned prot,
                                unsigned flags,
                                addr_t fd,
                                addr_t offset)
{
    Thread *thread = process->GetThreadList().GetSelectedThread().get();
    if (thread == NULL)
        return false;

    const bool append = true;
    const bool include_symbols = true;
    const bool include_inlines = false;
    SymbolContextList sc_list;
    const uint32_t count
        = process->GetTarget().GetImages().FindFunctions (ConstString ("mmap"),
                eFunctionNameTypeFull,
                include_symbols,
                include_inlines,
                append,
                sc_list);
    if (count > 0)
    {
        SymbolContext sc;
        if (sc_list.GetContextAtIndex(0, sc))
        {
            const uint32_t range_scope = eSymbolContextFunction | eSymbolContextSymbol;
            const bool use_inline_block_range = false;
            EvaluateExpressionOptions options;
            options.SetStopOthers(true);
            options.SetUnwindOnError(true);
            options.SetIgnoreBreakpoints(true);
            options.SetTryAllThreads(true);
            options.SetDebug (false);
            options.SetTimeoutUsec(500000);

            addr_t prot_arg, flags_arg = 0;
            if (prot == eMmapProtNone)
                prot_arg = PROT_NONE;
            else {
                prot_arg = 0;
                if (prot & eMmapProtExec)
                    prot_arg |= PROT_EXEC;
                if (prot & eMmapProtRead)
                    prot_arg |= PROT_READ;
                if (prot & eMmapProtWrite)
                    prot_arg |= PROT_WRITE;
            }

            const ArchSpec arch =  process->GetTarget().GetArchitecture();
            flags_arg = process->GetTarget().GetPlatform()->ConvertMmapFlagsToPlatform(arch,flags);

            AddressRange mmap_range;
            if (sc.GetAddressRange(range_scope, 0, use_inline_block_range, mmap_range))
            {
                ClangASTContext *clang_ast_context = process->GetTarget().GetScratchClangASTContext();
                CompilerType clang_void_ptr_type = clang_ast_context->GetBasicType(eBasicTypeVoid).GetPointerType();
                lldb::addr_t args[] = { addr, length, prot_arg, flags_arg, fd, offset };
                lldb::ThreadPlanSP call_plan_sp (new ThreadPlanCallFunction (*thread,
                                                 mmap_range.GetBaseAddress(),
                                                 clang_void_ptr_type,
                                                 args,
                                                 options));
                if (call_plan_sp)
                {
                    StreamFile error_strm;
                    // This plan is a utility plan, so set it to discard itself when done.
                    call_plan_sp->SetIsMasterPlan (true);
                    call_plan_sp->SetOkayToDiscard(true);

                    StackFrame *frame = thread->GetStackFrameAtIndex (0).get();
                    if (frame)
                    {
                        ExecutionContext exe_ctx;
                        frame->CalculateExecutionContext (exe_ctx);
                        ExpressionResults result = process->RunThreadPlan (exe_ctx,
                                                   call_plan_sp,
                                                   options,
                                                   error_strm);
                        if (result == eExpressionCompleted)
                        {

                            allocated_addr = call_plan_sp->GetReturnValueObject()->GetValueAsUnsigned(LLDB_INVALID_ADDRESS);
                            if (process->GetAddressByteSize() == 4)
                            {
                                if (allocated_addr == UINT32_MAX)
                                    return false;
                            }
                            else if (process->GetAddressByteSize() == 8)
                            {
                                if (allocated_addr == UINT64_MAX)
                                    return false;
                            }
                            return true;
                        }
                    }
//.........这里部分代码省略.........

bool
BreakpointLocation::ConditionSaysStop (ExecutionContext &exe_ctx, Error &error)
{
    Log *log = lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_BREAKPOINTS);
 
    Mutex::Locker evaluation_locker(m_condition_mutex);
    
    size_t condition_hash;
    const char *condition_text = GetConditionText(&condition_hash);
    
    if (!condition_text)
    {
        m_user_expression_sp.reset();
        return false;
    }
    
    if (condition_hash != m_condition_hash ||
        !m_user_expression_sp ||
        !m_user_expression_sp->MatchesContext(exe_ctx))
    {
        m_user_expression_sp.reset(new ClangUserExpression(condition_text,
                                                           NULL,
                                                           lldb::eLanguageTypeUnknown,
                                                           ClangUserExpression::eResultTypeAny));
        
        StreamString errors;
        
        if (!m_user_expression_sp->Parse(errors,
                                         exe_ctx,
                                         eExecutionPolicyOnlyWhenNeeded,
                                         true,
                                         false))
        {
            error.SetErrorStringWithFormat("Couldn't parse conditional expression:\n%s",
                                           errors.GetData());
            m_user_expression_sp.reset();
            return false;
        }
        
        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);
    
    Error expr_error;
    
    StreamString execution_errors;
    
    ExpressionVariableSP result_variable_sp;
    
    ExpressionResults result_code =
    m_user_expression_sp->Execute(execution_errors,
                                  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)
        {
            Scalar scalar_value;
            if (result_value_sp->ResolveValue (scalar_value))
            {
                if (scalar_value.ULongLong(1) == 0)
                    ret = false;
                else
                    ret = true;
                if (log)
                    log->Printf("Condition successfully evaluated, result is %s.\n",
                                ret ? "true" : "false");
            }
            else
            {
                ret = false;
                error.SetErrorString("Failed to get an integer result from the expression");
            }
        }
        else
        {
            ret = false;
            error.SetErrorString("Failed to get any result from the expression");
//.........这里部分代码省略.........

lldb::ExpressionResults
LLVMUserExpression::DoExecute(DiagnosticManager &diagnostic_manager,
                              ExecutionContext &exe_ctx,
                              const EvaluateExpressionOptions &options,
                              lldb::UserExpressionSP &shared_ptr_to_me,
                              lldb::ExpressionVariableSP &result) {
  // The expression log is quite verbose, and if you're just tracking the
  // execution of the
  // expression, it's quite convenient to have these logs come out with the STEP
  // log as well.
  Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_EXPRESSIONS |
                                                  LIBLLDB_LOG_STEP));

  if (m_jit_start_addr != LLDB_INVALID_ADDRESS || m_can_interpret) {
    lldb::addr_t struct_address = LLDB_INVALID_ADDRESS;

    if (!PrepareToExecuteJITExpression(diagnostic_manager, exe_ctx,
                                       struct_address)) {
      diagnostic_manager.Printf(
          eDiagnosticSeverityError,
          "errored out in %s, couldn't PrepareToExecuteJITExpression",
          __FUNCTION__);
      return lldb::eExpressionSetupError;
    }

    lldb::addr_t function_stack_bottom = LLDB_INVALID_ADDRESS;
    lldb::addr_t function_stack_top = LLDB_INVALID_ADDRESS;

    lldb::ValueObjectSP error_backstop_result_sp;

    if (m_can_interpret) {
      llvm::Module *module = m_execution_unit_sp->GetModule();
      llvm::Function *function = m_execution_unit_sp->GetFunction();

      if (!module || !function) {
        diagnostic_manager.PutCString(
            eDiagnosticSeverityError,
            "supposed to interpret, but nothing is there");
        return lldb::eExpressionSetupError;
      }

      Error interpreter_error;

      std::vector<lldb::addr_t> args;

      if (!AddArguments(exe_ctx, args, struct_address, diagnostic_manager)) {
        diagnostic_manager.Printf(eDiagnosticSeverityError,
                                  "errored out in %s, couldn't AddArguments",
                                  __FUNCTION__);
        return lldb::eExpressionSetupError;
      }

      function_stack_bottom = m_stack_frame_bottom;
      function_stack_top = m_stack_frame_top;

      IRInterpreter::Interpret(*module, *function, args,
                               *m_execution_unit_sp.get(), interpreter_error,
                               function_stack_bottom, function_stack_top,
                               exe_ctx);

      if (!interpreter_error.Success()) {
        diagnostic_manager.Printf(eDiagnosticSeverityError,
                                  "supposed to interpret, but failed: %s",
                                  interpreter_error.AsCString());
        return lldb::eExpressionDiscarded;
      }
    } else {
      if (!exe_ctx.HasThreadScope()) {
        diagnostic_manager.Printf(eDiagnosticSeverityError,
                                  "%s called with no thread selected",
                                  __FUNCTION__);
        return lldb::eExpressionSetupError;
      }

      Address wrapper_address(m_jit_start_addr);

      std::vector<lldb::addr_t> args;

      if (!AddArguments(exe_ctx, args, struct_address, diagnostic_manager)) {
        diagnostic_manager.Printf(eDiagnosticSeverityError,
                                  "errored out in %s, couldn't AddArguments",
                                  __FUNCTION__);
        return lldb::eExpressionSetupError;
      }

      lldb::ThreadPlanSP call_plan_sp(new ThreadPlanCallUserExpression(
          exe_ctx.GetThreadRef(), wrapper_address, args, options,
          shared_ptr_to_me));

      StreamString ss;
      if (!call_plan_sp || !call_plan_sp->ValidatePlan(&ss)) {
        diagnostic_manager.PutCString(eDiagnosticSeverityError, ss.GetData());
        return lldb::eExpressionSetupError;
      }

      ThreadPlanCallUserExpression *user_expression_plan =
          static_cast<ThreadPlanCallUserExpression *>(call_plan_sp.get());

      lldb::addr_t function_stack_pointer =
          user_expression_plan->GetFunctionStackPointer();
//.........这里部分代码省略.........

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.........

lldb::ExpressionResults
ClangUserExpression::Execute (Stream &error_stream,
                              ExecutionContext &exe_ctx,
                              const EvaluateExpressionOptions& options,
                              ClangUserExpression::ClangUserExpressionSP &shared_ptr_to_me,
                              lldb::ClangExpressionVariableSP &result)
{
    // The expression log is quite verbose, and if you're just tracking the execution of the
    // expression, it's quite convenient to have these logs come out with the STEP log as well.
    Log *log(lldb_private::GetLogIfAnyCategoriesSet (LIBLLDB_LOG_EXPRESSIONS | LIBLLDB_LOG_STEP));

    if (m_jit_start_addr != LLDB_INVALID_ADDRESS || m_can_interpret)
    {
        lldb::addr_t struct_address = LLDB_INVALID_ADDRESS;

        lldb::addr_t object_ptr = 0;
        lldb::addr_t cmd_ptr = 0;

        if (!PrepareToExecuteJITExpression (error_stream, exe_ctx, struct_address, object_ptr, cmd_ptr))
        {
            error_stream.Printf("Errored out in %s, couldn't PrepareToExecuteJITExpression", __FUNCTION__);
            return lldb::eExpressionSetupError;
        }

        lldb::addr_t function_stack_bottom = LLDB_INVALID_ADDRESS;
        lldb::addr_t function_stack_top = LLDB_INVALID_ADDRESS;

        if (m_can_interpret)
        {
            llvm::Module *module = m_execution_unit_sp->GetModule();
            llvm::Function *function = m_execution_unit_sp->GetFunction();

            if (!module || !function)
            {
                error_stream.Printf("Supposed to interpret, but nothing is there");
                return lldb::eExpressionSetupError;
            }

            Error interpreter_error;

            llvm::SmallVector <lldb::addr_t, 3> args;

            if (m_needs_object_ptr)
            {
                args.push_back(object_ptr);

                if (m_objectivec)
                    args.push_back(cmd_ptr);
            }

            args.push_back(struct_address);

            function_stack_bottom = m_stack_frame_bottom;
            function_stack_top = m_stack_frame_top;

            IRInterpreter::Interpret (*module,
                                      *function,
                                      args,
                                      *m_execution_unit_sp.get(),
                                      interpreter_error,
                                      function_stack_bottom,
                                      function_stack_top);

            if (!interpreter_error.Success())
            {
                error_stream.Printf("Supposed to interpret, but failed: %s", interpreter_error.AsCString());
                return lldb::eExpressionDiscarded;
            }
        }
        else
        {
            if (!exe_ctx.HasThreadScope())
            {
                error_stream.Printf("ClangUserExpression::Execute called with no thread selected.");
                return lldb::eExpressionSetupError;
            }

            Address wrapper_address (m_jit_start_addr);

            llvm::SmallVector <lldb::addr_t, 3> args;

            if (m_needs_object_ptr) {
                args.push_back(object_ptr);
                if (m_objectivec)
                    args.push_back(cmd_ptr);
            }

            args.push_back(struct_address);
         
            ThreadPlanCallUserExpression *user_expression_plan = 
                    new ThreadPlanCallUserExpression (exe_ctx.GetThreadRef(),
                                                      wrapper_address, 
                                                      args,
                                                      options,
                                                      shared_ptr_to_me);
            lldb::ThreadPlanSP call_plan_sp(user_expression_plan);

            if (!call_plan_sp || !call_plan_sp->ValidatePlan (&error_stream))
                return lldb::eExpressionSetupError;

//.........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.........