bool ClangUserExpression::PrepareForParsing(
    DiagnosticManager &diagnostic_manager, ExecutionContext &exe_ctx) {
  InstallContext(exe_ctx);

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

  Status err;
  ScanContext(exe_ctx, err);

  if (!err.Success()) {
    diagnostic_manager.PutString(eDiagnosticSeverityWarning, err.AsCString());
  }

  ////////////////////////////////////
  // Generate the expression
  //

  ApplyObjcCastHack(m_expr_text);

  SetupDeclVendor(exe_ctx, m_target);

  UpdateLanguageForExpr(diagnostic_manager, exe_ctx);
  return true;
}
Ejemplo n.º 2
0
lldb::ThreadPlanSP FunctionCaller::GetThreadPlanToCallFunction(
    ExecutionContext &exe_ctx, lldb::addr_t args_addr,
    const EvaluateExpressionOptions &options,
    DiagnosticManager &diagnostic_manager) {
  Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_EXPRESSIONS |
                                                  LIBLLDB_LOG_STEP));

  if (log)
    log->Printf("-- [FunctionCaller::GetThreadPlanToCallFunction] Creating "
                "thread plan to call function \"%s\" --",
                m_name.c_str());

  // FIXME: Use the errors Stream for better error reporting.
  Thread *thread = exe_ctx.GetThreadPtr();
  if (thread == NULL) {
    diagnostic_manager.PutString(
        eDiagnosticSeverityError,
        "Can't call a function without a valid thread.");
    return NULL;
  }

  // Okay, now run the function:

  Address wrapper_address(m_jit_start_addr);

  lldb::addr_t args = {args_addr};

  lldb::ThreadPlanSP new_plan_sp(new ThreadPlanCallFunction(
      *thread, wrapper_address, CompilerType(), args, options));
  new_plan_sp->SetIsMasterPlan(true);
  new_plan_sp->SetOkayToDiscard(false);
  return new_plan_sp;
}
bool ClangUserExpression::SetupPersistentState(DiagnosticManager &diagnostic_manager,
                                 ExecutionContext &exe_ctx) {
  if (Target *target = exe_ctx.GetTargetPtr()) {
    if (PersistentExpressionState *persistent_state =
            target->GetPersistentExpressionStateForLanguage(
                lldb::eLanguageTypeC)) {
      m_result_delegate.RegisterPersistentState(persistent_state);
    } else {
      diagnostic_manager.PutString(
          eDiagnosticSeverityError,
          "couldn't start parsing (no persistent data)");
      return false;
    }
  } else {
    diagnostic_manager.PutString(eDiagnosticSeverityError,
                                 "error: couldn't start parsing (no target)");
    return false;
  }
  return true;
}
void ClangUserExpression::UpdateLanguageForExpr(
    DiagnosticManager &diagnostic_manager, ExecutionContext &exe_ctx) {
  m_expr_lang = lldb::LanguageType::eLanguageTypeUnknown;

  std::string prefix = m_expr_prefix;

  if (m_options.GetExecutionPolicy() == eExecutionPolicyTopLevel) {
    m_transformed_text = m_expr_text;
  } else {
    std::unique_ptr<ExpressionSourceCode> source_code(
        ExpressionSourceCode::CreateWrapped(prefix.c_str(),
                                            m_expr_text.c_str()));

    if (m_in_cplusplus_method)
      m_expr_lang = lldb::eLanguageTypeC_plus_plus;
    else if (m_in_objectivec_method)
      m_expr_lang = lldb::eLanguageTypeObjC;
    else
      m_expr_lang = lldb::eLanguageTypeC;

    if (!source_code->GetText(m_transformed_text, m_expr_lang,
                              m_in_static_method, exe_ctx)) {
      diagnostic_manager.PutString(eDiagnosticSeverityError,
                                   "couldn't construct expression body");
      return;
    }

    // Find and store the start position of the original code inside the
    // transformed code. We need this later for the code completion.
    std::size_t original_start;
    std::size_t original_end;
    bool found_bounds = source_code->GetOriginalBodyBounds(
        m_transformed_text, m_expr_lang, original_start, original_end);
    if (found_bounds) {
      m_user_expression_start_pos = original_start;
    }
  }
}
Ejemplo n.º 5
0
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)
      args_list_buffer.append(", ");
  }
  m_wrapper_function_text.append(
      ");\n"); // Close off the function calling prototype.

  m_wrapper_function_text.append(args_buffer);

  m_wrapper_function_text.append("    ");
  m_wrapper_function_text.append(return_type_str);
  m_wrapper_function_text.append(" return_value;");
  m_wrapper_function_text.append("\n  };\n  struct ");
  m_wrapper_function_text.append(m_wrapper_struct_name);
  m_wrapper_function_text.append("* __lldb_fn_data = (struct ");
  m_wrapper_function_text.append(m_wrapper_struct_name);
  m_wrapper_function_text.append(" *) input;\n");

  m_wrapper_function_text.append(
      "  __lldb_fn_data->return_value = __lldb_fn_data->fn_ptr (");
  m_wrapper_function_text.append(args_list_buffer);
  m_wrapper_function_text.append(");\n}\n");

  Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_EXPRESSIONS));
  if (log)
    log->Printf("Expression: \n\n%s\n\n", m_wrapper_function_text.c_str());

  // Okay, now compile this expression

  lldb::ProcessSP jit_process_sp(m_jit_process_wp.lock());
  if (jit_process_sp) {
    const bool generate_debug_info = true;
    m_parser.reset(new ClangExpressionParser(jit_process_sp.get(), *this,
                                             generate_debug_info));

    num_errors = m_parser->Parse(diagnostic_manager);
  } else {
    diagnostic_manager.PutString(eDiagnosticSeverityError,
                                 "no process - unable to inject function");
    num_errors = 1;
  }

  m_compiled = (num_errors == 0);

  if (!m_compiled)
    return num_errors;

  return num_errors;
}
Ejemplo n.º 6
0
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.PutString(
            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.PutString(eDiagnosticSeverityError, ss.GetString());
        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);

      lldb::ExpressionResults execution_result =
          exe_ctx.GetProcessRef().RunThreadPlan(exe_ctx, call_plan_sp, options,
                                                diagnostic_manager);

      if (exe_ctx.GetProcessPtr())
        exe_ctx.GetProcessPtr()->SetRunningUserExpression(false);

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

      if (execution_result == lldb::eExpressionInterrupted ||
          execution_result == lldb::eExpressionHitBreakpoint) {
        const char *error_desc = NULL;

        if (call_plan_sp) {
          lldb::StopInfoSP real_stop_info_sp = call_plan_sp->GetRealStopInfo();
          if (real_stop_info_sp)
            error_desc = real_stop_info_sp->GetDescription();
        }
        if (error_desc)
          diagnostic_manager.Printf(eDiagnosticSeverityError,
                                    "Execution was interrupted, reason: %s.",
                                    error_desc);
        else
          diagnostic_manager.PutString(eDiagnosticSeverityError,
                                       "Execution was interrupted.");

        if ((execution_result == lldb::eExpressionInterrupted &&
             options.DoesUnwindOnError()) ||
            (execution_result == lldb::eExpressionHitBreakpoint &&
             options.DoesIgnoreBreakpoints()))
          diagnostic_manager.AppendMessageToDiagnostic(
              "The process has been returned to the state before expression "
              "evaluation.");
        else {
          if (execution_result == lldb::eExpressionHitBreakpoint)
            user_expression_plan->TransferExpressionOwnership();
          diagnostic_manager.AppendMessageToDiagnostic(
              "The process has been left at the point where it was "
              "interrupted, "
              "use \"thread return -x\" to return to the state before "
              "expression evaluation.");
        }

        return execution_result;
      } else if (execution_result == lldb::eExpressionStoppedForDebug) {
        diagnostic_manager.PutString(
            eDiagnosticSeverityRemark,
            "Execution was halted at the first instruction of the expression "
            "function because \"debug\" was requested.\n"
            "Use \"thread return -x\" to return to the state before expression "
            "evaluation.");
        return execution_result;
      } else if (execution_result != lldb::eExpressionCompleted) {
        diagnostic_manager.Printf(
            eDiagnosticSeverityError,
            "Couldn't execute function; result was %s",
            Process::ExecutionResultAsCString(execution_result));
        return execution_result;
      }
    }

    if (FinalizeJITExecution(diagnostic_manager, exe_ctx, result,
                             function_stack_bottom, function_stack_top)) {
      return lldb::eExpressionCompleted;
    } else {
      return lldb::eExpressionResultUnavailable;
    }
  } else {
    diagnostic_manager.PutString(
        eDiagnosticSeverityError,
        "Expression can't be run, because there is no JIT compiled function");
    return lldb::eExpressionSetupError;
  }
}
Ejemplo n.º 7
0
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.PutString(
        eDiagnosticSeverityError,
        "The context has changed before we could JIT the expression!");
    return false;
  }

  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;
}
unsigned
ClangExpressionParser::ParseInternal(DiagnosticManager &diagnostic_manager,
                                     CodeCompleteConsumer *completion_consumer,
                                     unsigned completion_line,
                                     unsigned completion_column) {
  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;

  // Clang wants to do completion on a real file known by Clang's file manager,
  // so we have to create one to make this work.
  // TODO: We probably could also simulate to Clang's file manager that there
  // is a real file that contains our code.
  bool should_create_file = completion_consumer != nullptr;

  // We also want a real file on disk if we generate full debug info.
  should_create_file |= m_compiler->getCodeGenOpts().getDebugInfo() ==
                        codegenoptions::FullDebugInfo;

  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;
}
Ejemplo n.º 9
0
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.PutString(eDiagnosticSeverityError,
                                 "Argument information was not correctly "
                                 "parsed, so the function cannot be called.");
    return false;
  }

  Status 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.

  Status 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;
}
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 =
        parser.RunStaticInitializers(m_execution_unit_sp, exe_ctx);

    if (!static_init_error.Success()) {
      const char *error_cstr = static_init_error.AsCString();
      if (error_cstr && error_cstr[0])
        diagnostic_manager.Printf(eDiagnosticSeverityError,
                                  "couldn't run static initializers: %s\n",
                                  error_cstr);
      else
        diagnostic_manager.PutString(eDiagnosticSeverityError,
                                     "couldn't run static initializers\n");
      return false;
    }
  }

  if (m_execution_unit_sp) {
    bool register_execution_unit = false;

    if (m_options.GetExecutionPolicy() == eExecutionPolicyTopLevel) {
      register_execution_unit = true;
    }

    // If there is more than one external function in the execution unit, it
    // needs to keep living even if it's not top level, because the result
    // could refer to that function.

    if (m_execution_unit_sp->GetJittedFunctions().size() > 1) {
      register_execution_unit = true;
    }

    if (register_execution_unit) {
      llvm::cast<PersistentExpressionState>(
          exe_ctx.GetTargetPtr()->GetPersistentExpressionStateForLanguage(
              m_language))
          ->RegisterExecutionUnit(m_execution_unit_sp);
    }
  }

  if (generate_debug_info) {
    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;
      target->GetImages().Append(jit_module_sp);
    }
  }

  if (process && m_jit_start_addr != LLDB_INVALID_ADDRESS)
    m_jit_process_wp = lldb::ProcessWP(process->shared_from_this());
  return true;
}