When building standalone Dart executable, put implementation of dart:io natives in a separate libra…

runtime/bin/io_natives.cc

+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#include "bin/io_natives.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "bin/builtin.h"
+#include "bin/dartutils.h"
+#include "include/dart_api.h"
+#include "platform/assert.h"
+
+
+// Lists the native functions implementing advanced dart:io classes.
+// Some classes, like File and Directory, list their implementations in
+// builtin_natives.cc instead.
+#define IO_NATIVE_LIST(V)                                                      \
+  V(EventHandler_Start, 1)                                                     \
+  V(EventHandler_SendData, 4)                                                  \
+  V(Process_Start, 10)                                                         \
+  V(Process_Kill, 3)                                                           \
+  V(ServerSocket_CreateBindListen, 4)                                          \
+  V(ServerSocket_Accept, 2)                                                    \
+  V(Socket_CreateConnect, 3)                                                   \
+  V(Socket_Available, 1)                                                       \
+  V(Socket_Read, 2)                                                            \
+  V(Socket_ReadList, 4)                                                        \
+  V(Socket_WriteList, 4)                                                       \
+  V(Socket_GetPort, 1)                                                         \
+  V(Socket_GetRemotePeer, 1)                                                   \
+  V(Socket_GetError, 1)                                                        \
+  V(Socket_GetStdioHandle, 2)                                                  \
+  V(Socket_NewServicePort, 0)
+
+
+IO_NATIVE_LIST(DECLARE_FUNCTION);
+
+static struct NativeEntries {
+  const char* name_;
+  Dart_NativeFunction function_;
+  int argument_count_;
+} IOEntries[] = {
+  IO_NATIVE_LIST(REGISTER_FUNCTION)
+};
+
+
+Dart_NativeFunction IONativeLookup(Dart_Handle name,
+                                   int argument_count) {
+  const char* function_name = NULL;
+  Dart_Handle result = Dart_StringToCString(name, &function_name);
+  DART_CHECK_VALID(result);
+  ASSERT(function_name != NULL);
+  int num_entries = sizeof(IOEntries) / sizeof(struct NativeEntries);
+  for (int i = 0; i < num_entries; i++) {
+    struct NativeEntries* entry = &(IOEntries[i]);
+    if (!strcmp(function_name, entry->name_) &&
+        (entry->argument_count_ == argument_count)) {
+      return reinterpret_cast<Dart_NativeFunction>(entry->function_);
+    }
+  }
+  return NULL;
+}