C++ DiagnosticManager::Printf方法代码示例

bool LLVMUserExpression::FinalizeJITExecution(
    DiagnosticManager &diagnostic_manager, ExecutionContext &exe_ctx,
    lldb::ExpressionVariableSP &result, lldb::addr_t function_stack_bottom,
    lldb::addr_t function_stack_top) {
  Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));

  if (log)
    log->Printf("-- [UserExpression::FinalizeJITExecution] Dematerializing "
                "after execution --");

  if (!m_dematerializer_sp) {
    diagnostic_manager.Printf(eDiagnosticSeverityError,
                              "Couldn't apply expression side effects : no "
                              "dematerializer is present");
    return false;
  }

  Error dematerialize_error;

  m_dematerializer_sp->Dematerialize(dematerialize_error, function_stack_bottom,
                                     function_stack_top);

  if (!dematerialize_error.Success()) {
    diagnostic_manager.Printf(eDiagnosticSeverityError,
                              "Couldn't apply expression side effects : %s",
                              dematerialize_error.AsCString("unknown error"));
    return false;
  }

  result =
      GetResultAfterDematerialization(exe_ctx.GetBestExecutionContextScope());

  if (result)
    result->TransferAddress();

  m_dematerializer_sp.reset();

  return true;
}

bool
GoUserExpression::Parse(DiagnosticManager &diagnostic_manager, ExecutionContext &exe_ctx, lldb_private::ExecutionPolicy execution_policy,
                        bool keep_result_in_memory, bool generate_debug_info, uint32_t line_offset)
{
    InstallContext(exe_ctx);
    m_interpreter.reset(new GoInterpreter(exe_ctx, GetUserText()));
    if (m_interpreter->Parse())
        return true;
    const char *error_cstr = m_interpreter->error().AsCString();
    if (error_cstr && error_cstr[0])
        diagnostic_manager.PutCString(eDiagnosticSeverityError, error_cstr);
    else
        diagnostic_manager.Printf(eDiagnosticSeverityError, "expression can't be interpreted or run");
    return false;
}

unsigned

ClangFunctionCaller::CompileFunction(lldb::ThreadSP thread_to_use_sp,
                                     DiagnosticManager &diagnostic_manager) {
  if (m_compiled)
    return 0;

  // Compilation might call code, make sure to keep on the thread the caller
  // indicated.
  ThreadList::ExpressionExecutionThreadPusher execution_thread_pusher(
      thread_to_use_sp);

  // FIXME: How does clang tell us there's no return value?  We need to handle
  // that case.
  unsigned num_errors = 0;

  std::string return_type_str(
      m_function_return_type.GetTypeName().AsCString(""));

  // Cons up the function we're going to wrap our call in, then compile it...
  // We declare the function "extern "C"" because the compiler might be in C++
  // mode which would mangle the name and then we couldn't find it again...
  m_wrapper_function_text.clear();
  m_wrapper_function_text.append("extern \"C\" void ");
  m_wrapper_function_text.append(m_wrapper_function_name);
  m_wrapper_function_text.append(" (void *input)\n{\n    struct ");
  m_wrapper_function_text.append(m_wrapper_struct_name);
  m_wrapper_function_text.append(" \n  {\n");
  m_wrapper_function_text.append("    ");
  m_wrapper_function_text.append(return_type_str);
  m_wrapper_function_text.append(" (*fn_ptr) (");

  // Get the number of arguments.  If we have a function type and it is
  // prototyped,
  // trust that, otherwise use the values we were given.

  // FIXME: This will need to be extended to handle Variadic functions.  We'll
  // need
  // to pull the defined arguments out of the function, then add the types from
  // the
  // arguments list for the variable arguments.

  uint32_t num_args = UINT32_MAX;
  bool trust_function = false;
  // GetArgumentCount returns -1 for an unprototyped function.
  CompilerType function_clang_type;
  if (m_function_ptr) {
    function_clang_type = m_function_ptr->GetCompilerType();
    if (function_clang_type) {
      int num_func_args = function_clang_type.GetFunctionArgumentCount();
      if (num_func_args >= 0) {
        trust_function = true;
        num_args = num_func_args;
      }
    }
  }

  if (num_args == UINT32_MAX)
    num_args = m_arg_values.GetSize();

  std::string args_buffer; // This one stores the definition of all the args in
                           // "struct caller".
  std::string args_list_buffer; // This one stores the argument list called from
                                // the structure.
  for (size_t i = 0; i < num_args; i++) {
    std::string type_name;

    if (trust_function) {
      type_name = function_clang_type.GetFunctionArgumentTypeAtIndex(i)
                      .GetTypeName()
                      .AsCString("");
    } else {
      CompilerType clang_qual_type =
          m_arg_values.GetValueAtIndex(i)->GetCompilerType();
      if (clang_qual_type) {
        type_name = clang_qual_type.GetTypeName().AsCString("");
      } else {
        diagnostic_manager.Printf(
            eDiagnosticSeverityError,
            "Could not determine type of input value %" PRIu64 ".",
            (uint64_t)i);
        return 1;
      }
    }

    m_wrapper_function_text.append(type_name);
    if (i < num_args - 1)
      m_wrapper_function_text.append(", ");

    char arg_buf[32];
    args_buffer.append("    ");
    args_buffer.append(type_name);
    snprintf(arg_buf, 31, "arg_%" PRIu64, (uint64_t)i);
    args_buffer.push_back(' ');
    args_buffer.append(arg_buf);
    args_buffer.append(";\n");

    args_list_buffer.append("__lldb_fn_data->");
    args_list_buffer.append(arg_buf);
    if (i < num_args - 1)
//.........这里部分代码省略.........

//------------------------------------------------------------------
/// Install the utility function into a process
///
/// @param[in] diagnostic_manager
///     A diagnostic manager to report errors and warnings to.
///
/// @param[in] exe_ctx
///     The execution context to install the utility function to.
///
/// @return
///     True on success (no errors); false otherwise.
//------------------------------------------------------------------
bool ClangUtilityFunction::Install(DiagnosticManager &diagnostic_manager,
                                   ExecutionContext &exe_ctx) {
  if (m_jit_start_addr != LLDB_INVALID_ADDRESS) {
    diagnostic_manager.PutCString(eDiagnosticSeverityWarning,
                                  "already installed");
    return false;
  }

  ////////////////////////////////////
  // Set up the target and compiler
  //

  Target *target = exe_ctx.GetTargetPtr();

  if (!target) {
    diagnostic_manager.PutCString(eDiagnosticSeverityError, "invalid target");
    return false;
  }

  Process *process = exe_ctx.GetProcessPtr();

  if (!process) {
    diagnostic_manager.PutCString(eDiagnosticSeverityError, "invalid process");
    return false;
  }

  //////////////////////////
  // Parse the expression
  //

  bool keep_result_in_memory = false;

  ResetDeclMap(exe_ctx, keep_result_in_memory);

  if (!DeclMap()->WillParse(exe_ctx, NULL)) {
    diagnostic_manager.PutCString(
        eDiagnosticSeverityError,
        "current process state is unsuitable for expression parsing");
    return false;
  }

  const bool generate_debug_info = true;
  ClangExpressionParser parser(exe_ctx.GetBestExecutionContextScope(), *this,
                               generate_debug_info);

  unsigned num_errors = parser.Parse(diagnostic_manager);

  if (num_errors) {
    ResetDeclMap();

    return false;
  }

  //////////////////////////////////
  // JIT the output of the parser
  //

  bool can_interpret = false; // should stay that way

  Error jit_error = parser.PrepareForExecution(
      m_jit_start_addr, m_jit_end_addr, m_execution_unit_sp, exe_ctx,
      can_interpret, eExecutionPolicyAlways);

  if (m_jit_start_addr != LLDB_INVALID_ADDRESS) {
    m_jit_process_wp = process->shared_from_this();
    if (parser.GetGenerateDebugInfo())
      m_execution_unit_sp->CreateJITModule(FunctionName());
  }

#if 0
	// jingham: look here
    StreamFile logfile ("/tmp/exprs.txt", "a");
    logfile.Printf ("0x%16.16" PRIx64 ": func = %s, source =\n%s\n",
                    m_jit_start_addr, 
                    m_function_name.c_str(), 
                    m_function_text.c_str());
#endif

  DeclMap()->DidParse();

  ResetDeclMap();

  if (jit_error.Success()) {
    return true;
  } else {
    const char *error_cstr = jit_error.AsCString();
    if (error_cstr && error_cstr[0]) {
      diagnostic_manager.Printf(eDiagnosticSeverityError, "%s", error_cstr);
//.........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;

        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();

            function_stack_bottom = function_stack_pointer - HostInfo::GetPageSize();
            function_stack_top = function_stack_pointer;

            if (log)
                log->Printf("-- [UserExpression::Execute] Execution of expression begins --");

            if (exe_ctx.GetProcessPtr())
                exe_ctx.GetProcessPtr()->SetRunningUserExpression(true);
//.........这里部分代码省略.........

bool
LLVMUserExpression::PrepareToExecuteJITExpression(DiagnosticManager &diagnostic_manager, ExecutionContext &exe_ctx,
                                                  lldb::addr_t &struct_address)
{
    lldb::TargetSP target;
    lldb::ProcessSP process;
    lldb::StackFrameSP frame;

    if (!LockAndCheckContext(exe_ctx, target, process, frame))
    {
        diagnostic_manager.PutCString(eDiagnosticSeverityError,
                                      "The context has changed before we could JIT the expression!");
        return false;
    }

    if (m_options.GetREPLEnabled())
    {
        Error materialize_error;
        
        m_dematerializer_sp = m_materializer_ap->Materialize(frame, *m_execution_unit_sp, LLDB_INVALID_ADDRESS, materialize_error);
        
        if (!materialize_error.Success())
        {
            diagnostic_manager.Printf(eDiagnosticSeverityError, "Couldn't materialize: %s\n", materialize_error.AsCString());
            return false;
        }
        
        return true;
    }

    if (m_jit_start_addr != LLDB_INVALID_ADDRESS || m_can_interpret)
    {
        if (m_materialized_address == LLDB_INVALID_ADDRESS)
        {
            Error alloc_error;

            IRMemoryMap::AllocationPolicy policy =
                m_can_interpret ? IRMemoryMap::eAllocationPolicyHostOnly : IRMemoryMap::eAllocationPolicyMirror;

            const bool zero_memory = false;

            m_materialized_address = m_execution_unit_sp->Malloc(m_materializer_ap->GetStructByteSize(), 
                                                                 m_materializer_ap->GetStructAlignment(),
                                                                 lldb::ePermissionsReadable | lldb::ePermissionsWritable, 
                                                                 policy,
                                                                 zero_memory, 
                                                                 alloc_error);

            if (!alloc_error.Success())
            {
                diagnostic_manager.Printf(eDiagnosticSeverityError,
                                          "Couldn't allocate space for materialized struct: %s",
                                          alloc_error.AsCString());
                return false;
            }
        }

        struct_address = m_materialized_address;

        if (m_can_interpret && m_stack_frame_bottom == LLDB_INVALID_ADDRESS)
        {
            Error alloc_error;

            const size_t stack_frame_size = 512 * 1024;

            const bool zero_memory = false;

            m_stack_frame_bottom = m_execution_unit_sp->Malloc(stack_frame_size, 
                                                               8,
                                                               lldb::ePermissionsReadable | lldb::ePermissionsWritable,
                                                               IRMemoryMap::eAllocationPolicyHostOnly, 
                                                               zero_memory,
                                                               alloc_error);

            m_stack_frame_top = m_stack_frame_bottom + stack_frame_size;

            if (!alloc_error.Success())
            {
                diagnostic_manager.Printf(eDiagnosticSeverityError, "Couldn't allocate space for the stack frame: %s",
                                          alloc_error.AsCString());
                return false;
            }
        }

        Error materialize_error;

        m_dematerializer_sp =
            m_materializer_ap->Materialize(frame, *m_execution_unit_sp, struct_address, materialize_error);

        if (!materialize_error.Success())
        {
            diagnostic_manager.Printf(eDiagnosticSeverityError, "Couldn't materialize: %s",
                                      materialize_error.AsCString());
            return false;
        }
    }
    return true;
}

bool
FunctionCaller::WriteFunctionArguments(ExecutionContext &exe_ctx, lldb::addr_t &args_addr_ref, ValueList &arg_values,
                                       DiagnosticManager &diagnostic_manager)
{
    // All the information to reconstruct the struct is provided by the
    // StructExtractor.
    if (!m_struct_valid)
    {
        diagnostic_manager.PutCString(
            eDiagnosticSeverityError,
            "Argument information was not correctly parsed, so the function cannot be called.");
        return false;
    }

    Error error;
    lldb::ExpressionResults return_value = lldb::eExpressionSetupError;

    Process *process = exe_ctx.GetProcessPtr();

    if (process == NULL)
        return return_value;

    lldb::ProcessSP jit_process_sp(m_jit_process_wp.lock());
    
    if (process != jit_process_sp.get())
        return false;
                
    if (args_addr_ref == LLDB_INVALID_ADDRESS)
    {
        args_addr_ref = process->AllocateMemory(m_struct_size, lldb::ePermissionsReadable|lldb::ePermissionsWritable, error);
        if (args_addr_ref == LLDB_INVALID_ADDRESS)
            return false;
        m_wrapper_args_addrs.push_back (args_addr_ref);
    } 
    else 
    {
        // Make sure this is an address that we've already handed out.
        if (find (m_wrapper_args_addrs.begin(), m_wrapper_args_addrs.end(), args_addr_ref) == m_wrapper_args_addrs.end())
        {
            return false;
        }
    }

    // TODO: verify fun_addr needs to be a callable address
    Scalar fun_addr (m_function_addr.GetCallableLoadAddress(exe_ctx.GetTargetPtr()));
    uint64_t first_offset = m_member_offsets[0];
    process->WriteScalarToMemory(args_addr_ref + first_offset, fun_addr, process->GetAddressByteSize(), error);

    // FIXME: We will need to extend this for Variadic functions.

    Error value_error;

    size_t num_args = arg_values.GetSize();
    if (num_args != m_arg_values.GetSize())
    {
        diagnostic_manager.Printf(eDiagnosticSeverityError,
                                  "Wrong number of arguments - was: %" PRIu64 " should be: %" PRIu64 "",
                                  (uint64_t)num_args, (uint64_t)m_arg_values.GetSize());
        return false;
    }

    for (size_t i = 0; i < num_args; i++)
    {
        // FIXME: We should sanity check sizes.

        uint64_t offset = m_member_offsets[i+1]; // Clang sizes are in bytes.
        Value *arg_value = arg_values.GetValueAtIndex(i);
        
        // FIXME: For now just do scalars:
        
        // Special case: if it's a pointer, don't do anything (the ABI supports passing cstrings)
        
        if (arg_value->GetValueType() == Value::eValueTypeHostAddress &&
            arg_value->GetContextType() == Value::eContextTypeInvalid &&
            arg_value->GetCompilerType().IsPointerType())
            continue;
        
        const Scalar &arg_scalar = arg_value->ResolveValue(&exe_ctx);

        if (!process->WriteScalarToMemory(args_addr_ref + offset, arg_scalar, arg_scalar.GetByteSize(), error))
            return false;
    }

    return true;
}

unsigned
ClangExpressionParser::Parse(DiagnosticManager &diagnostic_manager)
{
    ClangDiagnosticManagerAdapter *adapter =
        static_cast<ClangDiagnosticManagerAdapter *>(m_compiler->getDiagnostics().getClient());
    clang::TextDiagnosticBuffer *diag_buf = adapter->GetPassthrough();
    diag_buf->FlushDiagnostics(m_compiler->getDiagnostics());

    adapter->ResetManager(&diagnostic_manager);

    const char *expr_text = m_expr.Text();

    clang::SourceManager &source_mgr = m_compiler->getSourceManager();
    bool created_main_file = false;
    if (m_compiler->getCodeGenOpts().getDebugInfo() == codegenoptions::FullDebugInfo)
    {
        int temp_fd = -1;
        llvm::SmallString<PATH_MAX> result_path;
        FileSpec tmpdir_file_spec;
        if (HostInfo::GetLLDBPath(lldb::ePathTypeLLDBTempSystemDir, tmpdir_file_spec))
        {
            tmpdir_file_spec.AppendPathComponent("lldb-%%%%%%.expr");
            std::string temp_source_path = tmpdir_file_spec.GetPath();
            llvm::sys::fs::createUniqueFile(temp_source_path, temp_fd, result_path);
        }
        else
        {
            llvm::sys::fs::createTemporaryFile("lldb", "expr", temp_fd, result_path);
        }

        if (temp_fd != -1)
        {
            lldb_private::File file(temp_fd, true);
            const size_t expr_text_len = strlen(expr_text);
            size_t bytes_written = expr_text_len;
            if (file.Write(expr_text, bytes_written).Success())
            {
                if (bytes_written == expr_text_len)
                {
                    file.Close();
                    source_mgr.setMainFileID(source_mgr.createFileID(m_file_manager->getFile(result_path),
                                                                     SourceLocation(), SrcMgr::C_User));
                    created_main_file = true;
                }
            }
        }
    }

    if (!created_main_file)
    {
        std::unique_ptr<MemoryBuffer> memory_buffer = MemoryBuffer::getMemBufferCopy(expr_text, __FUNCTION__);
        source_mgr.setMainFileID(source_mgr.createFileID(std::move(memory_buffer)));
    }

    diag_buf->BeginSourceFile(m_compiler->getLangOpts(), &m_compiler->getPreprocessor());

    ClangExpressionHelper *type_system_helper = dyn_cast<ClangExpressionHelper>(m_expr.GetTypeSystemHelper());

    ASTConsumer *ast_transformer = type_system_helper->ASTTransformer(m_code_generator.get());

    if (ClangExpressionDeclMap *decl_map = type_system_helper->DeclMap())
        decl_map->InstallCodeGenerator(m_code_generator.get());

    if (ast_transformer)
    {
        ast_transformer->Initialize(m_compiler->getASTContext());
        ParseAST(m_compiler->getPreprocessor(), ast_transformer, m_compiler->getASTContext());
    }
    else
    {
        m_code_generator->Initialize(m_compiler->getASTContext());
        ParseAST(m_compiler->getPreprocessor(), m_code_generator.get(), m_compiler->getASTContext());
    }

    diag_buf->EndSourceFile();

    unsigned num_errors = diag_buf->getNumErrors();

    if (m_pp_callbacks && m_pp_callbacks->hasErrors())
    {
        num_errors++;
        diagnostic_manager.PutCString(eDiagnosticSeverityError, "while importing modules:");
        diagnostic_manager.AppendMessageToDiagnostic(m_pp_callbacks->getErrorString().c_str());
    }

    if (!num_errors)
    {
        if (type_system_helper->DeclMap() && !type_system_helper->DeclMap()->ResolveUnknownTypes())
        {
            diagnostic_manager.Printf(eDiagnosticSeverityError, "Couldn't infer the type of a variable");
            num_errors++;
        }
    }

    if (!num_errors)
    {
        type_system_helper->CommitPersistentDecls();
    }

    adapter->ResetManager();
//.........这里部分代码省略.........

//.........这里部分代码省略.........
  if (should_create_file) {
    int temp_fd = -1;
    llvm::SmallString<128> result_path;
    if (FileSpec tmpdir_file_spec = HostInfo::GetProcessTempDir()) {
      tmpdir_file_spec.AppendPathComponent("lldb-%%%%%%.expr");
      std::string temp_source_path = tmpdir_file_spec.GetPath();
      llvm::sys::fs::createUniqueFile(temp_source_path, temp_fd, result_path);
    } else {
      llvm::sys::fs::createTemporaryFile("lldb", "expr", temp_fd, result_path);
    }

    if (temp_fd != -1) {
      lldb_private::File file(temp_fd, true);
      const size_t expr_text_len = strlen(expr_text);
      size_t bytes_written = expr_text_len;
      if (file.Write(expr_text, bytes_written).Success()) {
        if (bytes_written == expr_text_len) {
          file.Close();
          source_mgr.setMainFileID(
              source_mgr.createFileID(m_file_manager->getFile(result_path),
                                      SourceLocation(), SrcMgr::C_User));
          created_main_file = true;
        }
      }
    }
  }

  if (!created_main_file) {
    std::unique_ptr<MemoryBuffer> memory_buffer =
        MemoryBuffer::getMemBufferCopy(expr_text, __FUNCTION__);
    source_mgr.setMainFileID(source_mgr.createFileID(std::move(memory_buffer)));
  }

  diag_buf->BeginSourceFile(m_compiler->getLangOpts(),
                            &m_compiler->getPreprocessor());

  ClangExpressionHelper *type_system_helper =
      dyn_cast<ClangExpressionHelper>(m_expr.GetTypeSystemHelper());

  ASTConsumer *ast_transformer =
      type_system_helper->ASTTransformer(m_code_generator.get());

  if (ClangExpressionDeclMap *decl_map = type_system_helper->DeclMap())
    decl_map->InstallCodeGenerator(m_code_generator.get());

  // If we want to parse for code completion, we need to attach our code
  // completion consumer to the Sema and specify a completion position.
  // While parsing the Sema will call this consumer with the provided
  // completion suggestions.
  if (completion_consumer) {
    auto main_file = source_mgr.getFileEntryForID(source_mgr.getMainFileID());
    auto &PP = m_compiler->getPreprocessor();
    // Lines and columns start at 1 in Clang, but code completion positions are
    // indexed from 0, so we need to add 1 to the line and column here.
    ++completion_line;
    ++completion_column;
    PP.SetCodeCompletionPoint(main_file, completion_line, completion_column);
  }

  if (ast_transformer) {
    ast_transformer->Initialize(m_compiler->getASTContext());
    ParseAST(m_compiler->getPreprocessor(), ast_transformer,
             m_compiler->getASTContext(), false, TU_Complete,
             completion_consumer);
  } else {
    m_code_generator->Initialize(m_compiler->getASTContext());
    ParseAST(m_compiler->getPreprocessor(), m_code_generator.get(),
             m_compiler->getASTContext(), false, TU_Complete,
             completion_consumer);
  }

  diag_buf->EndSourceFile();

  unsigned num_errors = diag_buf->getNumErrors();

  if (m_pp_callbacks && m_pp_callbacks->hasErrors()) {
    num_errors++;
    diagnostic_manager.PutString(eDiagnosticSeverityError,
                                 "while importing modules:");
    diagnostic_manager.AppendMessageToDiagnostic(
        m_pp_callbacks->getErrorString());
  }

  if (!num_errors) {
    if (type_system_helper->DeclMap() &&
        !type_system_helper->DeclMap()->ResolveUnknownTypes()) {
      diagnostic_manager.Printf(eDiagnosticSeverityError,
                                "Couldn't infer the type of a variable");
      num_errors++;
    }
  }

  if (!num_errors) {
    type_system_helper->CommitPersistentDecls();
  }

  adapter->ResetManager();

  return num_errors;
}

bool ClangUserExpression::AddArguments(ExecutionContext &exe_ctx,
                                       std::vector<lldb::addr_t> &args,
                                       lldb::addr_t struct_address,
                                       DiagnosticManager &diagnostic_manager) {
  lldb::addr_t object_ptr = LLDB_INVALID_ADDRESS;
  lldb::addr_t cmd_ptr = LLDB_INVALID_ADDRESS;

  if (m_needs_object_ptr) {
    lldb::StackFrameSP frame_sp = exe_ctx.GetFrameSP();
    if (!frame_sp)
      return true;

    ConstString object_name;

    if (m_in_cplusplus_method) {
      object_name.SetCString("this");
    } else if (m_in_objectivec_method) {
      object_name.SetCString("self");
    } else {
      diagnostic_manager.PutString(
          eDiagnosticSeverityError,
          "need object pointer but don't know the language");
      return false;
    }

    Status object_ptr_error;

    object_ptr = GetObjectPointer(frame_sp, object_name, object_ptr_error);

    if (!object_ptr_error.Success()) {
      exe_ctx.GetTargetRef().GetDebugger().GetAsyncOutputStream()->Printf(
          "warning: `%s' is not accessible (substituting 0)\n",
          object_name.AsCString());
      object_ptr = 0;
    }

    if (m_in_objectivec_method) {
      ConstString cmd_name("_cmd");

      cmd_ptr = GetObjectPointer(frame_sp, cmd_name, object_ptr_error);

      if (!object_ptr_error.Success()) {
        diagnostic_manager.Printf(
            eDiagnosticSeverityWarning,
            "couldn't get cmd pointer (substituting NULL): %s",
            object_ptr_error.AsCString());
        cmd_ptr = 0;
      }
    }

    args.push_back(object_ptr);

    if (m_in_objectivec_method)
      args.push_back(cmd_ptr);

    args.push_back(struct_address);
  } else {
    args.push_back(struct_address);
  }
  return true;
}

bool ClangUserExpression::Parse(DiagnosticManager &diagnostic_manager,
                                ExecutionContext &exe_ctx,
                                lldb_private::ExecutionPolicy execution_policy,
                                bool keep_result_in_memory,
                                bool generate_debug_info) {
  Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));

  if (!PrepareForParsing(diagnostic_manager, exe_ctx))
    return false;

  if (log)
    log->Printf("Parsing the following code:\n%s", m_transformed_text.c_str());

  ////////////////////////////////////
  // Set up the target and compiler
  //

  Target *target = exe_ctx.GetTargetPtr();

  if (!target) {
    diagnostic_manager.PutString(eDiagnosticSeverityError, "invalid target");
    return false;
  }

  //////////////////////////
  // Parse the expression
  //

  m_materializer_ap.reset(new Materializer());

  ResetDeclMap(exe_ctx, m_result_delegate, keep_result_in_memory);

  OnExit on_exit([this]() { ResetDeclMap(); });

  if (!DeclMap()->WillParse(exe_ctx, m_materializer_ap.get())) {
    diagnostic_manager.PutString(
        eDiagnosticSeverityError,
        "current process state is unsuitable for expression parsing");
    return false;
  }

  if (m_options.GetExecutionPolicy() == eExecutionPolicyTopLevel) {
    DeclMap()->SetLookupsEnabled(true);
  }

  Process *process = exe_ctx.GetProcessPtr();
  ExecutionContextScope *exe_scope = process;

  if (!exe_scope)
    exe_scope = exe_ctx.GetTargetPtr();

  // We use a shared pointer here so we can use the original parser - if it
  // succeeds or the rewrite parser we might make if it fails.  But the
  // parser_sp will never be empty.

  ClangExpressionParser parser(exe_scope, *this, generate_debug_info);

  unsigned num_errors = parser.Parse(diagnostic_manager);

  // Check here for FixItHints.  If there are any try to apply the fixits and
  // set the fixed text in m_fixed_text before returning an error.
  if (num_errors) {
    if (diagnostic_manager.HasFixIts()) {
      if (parser.RewriteExpression(diagnostic_manager)) {
        size_t fixed_start;
        size_t fixed_end;
        const std::string &fixed_expression =
            diagnostic_manager.GetFixedExpression();
        if (ExpressionSourceCode::GetOriginalBodyBounds(
                fixed_expression, m_expr_lang, fixed_start, fixed_end))
          m_fixed_text =
              fixed_expression.substr(fixed_start, fixed_end - fixed_start);
      }
    }
    return false;
  }

  //////////////////////////////////////////////////////////////////////////////////////////
  // Prepare the output of the parser for execution, evaluating it statically
  // if possible
  //

  {
    Status jit_error = parser.PrepareForExecution(
        m_jit_start_addr, m_jit_end_addr, m_execution_unit_sp, exe_ctx,
        m_can_interpret, execution_policy);

    if (!jit_error.Success()) {
      const char *error_cstr = jit_error.AsCString();
      if (error_cstr && error_cstr[0])
        diagnostic_manager.PutString(eDiagnosticSeverityError, error_cstr);
      else
        diagnostic_manager.PutString(eDiagnosticSeverityError,
                                     "expression can't be interpreted or run");
      return false;
    }
  }

  if (exe_ctx.GetProcessPtr() && execution_policy == eExecutionPolicyTopLevel) {
    Status static_init_error =
//.........这里部分代码省略.........

unsigned
ClangExpressionParser::Parse (DiagnosticManager &diagnostic_manager,
                              uint32_t first_line,
                              uint32_t last_line,
                              uint32_t line_offset)
{
    ClangDiagnosticManagerAdapter *adapter =
        static_cast<ClangDiagnosticManagerAdapter *>(m_compiler->getDiagnostics().getClient());
    clang::TextDiagnosticBuffer *diag_buf = adapter->GetPassthrough();
    diag_buf->FlushDiagnostics(m_compiler->getDiagnostics());

    adapter->ResetManager(&diagnostic_manager);

    const char *expr_text = m_expr.Text();

    clang::SourceManager &SourceMgr = m_compiler->getSourceManager();
    bool created_main_file = false;
    if (m_expr.GetOptions() && m_expr.GetOptions()->GetPoundLineFilePath() == NULL && m_compiler->getCodeGenOpts().getDebugInfo() == CodeGenOptions::FullDebugInfo)
    {
        std::string temp_source_path;
        if (ExpressionSourceCode::SaveExpressionTextToTempFile(expr_text, *m_expr.GetOptions(), temp_source_path))
        {
            auto file = m_file_manager->getFile(temp_source_path);
            if (file)
            {
                SourceMgr.setMainFileID(SourceMgr.createFileID (file,
                                                                SourceLocation(),
                                                                SrcMgr::C_User));
                created_main_file = true;
            }
        }
    }

    if (!created_main_file)
    {
        std::unique_ptr<MemoryBuffer> memory_buffer = MemoryBuffer::getMemBufferCopy(expr_text, __FUNCTION__);
        SourceMgr.setMainFileID(SourceMgr.createFileID(std::move(memory_buffer)));
    }

    diag_buf->BeginSourceFile(m_compiler->getLangOpts(), &m_compiler->getPreprocessor());

    ClangExpressionHelper *type_system_helper = dyn_cast<ClangExpressionHelper>(m_expr.GetTypeSystemHelper());

    ASTConsumer *ast_transformer = type_system_helper->ASTTransformer(m_code_generator.get());

    if (ClangExpressionDeclMap *decl_map = type_system_helper->DeclMap())
        decl_map->InstallCodeGenerator(m_code_generator.get());

    if (ast_transformer)
    {
        ast_transformer->Initialize(m_compiler->getASTContext());
        ParseAST(m_compiler->getPreprocessor(), ast_transformer, m_compiler->getASTContext());
    }
    else
    {
        m_code_generator->Initialize(m_compiler->getASTContext());
        ParseAST(m_compiler->getPreprocessor(), m_code_generator.get(), m_compiler->getASTContext());
    }

    diag_buf->EndSourceFile();

    unsigned num_errors = diag_buf->getNumErrors();

    if (m_pp_callbacks && m_pp_callbacks->hasErrors())
    {
        num_errors++;
        diagnostic_manager.PutCString(eDiagnosticSeverityError, "while importing modules:");
        diagnostic_manager.AppendMessageToDiagnostic(m_pp_callbacks->getErrorString().c_str());
    }

    if (!num_errors)
    {
        if (type_system_helper->DeclMap() && !type_system_helper->DeclMap()->ResolveUnknownTypes())
        {
            diagnostic_manager.Printf(eDiagnosticSeverityError, "Couldn't infer the type of a variable");
            num_errors++;
        }
    }

    if (!num_errors)
    {
        type_system_helper->CommitPersistentDecls();
    }

    adapter->ResetManager();

    return num_errors;
}