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

runtime/bin/builtin_fulllib.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 <stdio.h>
 
 #include "include/dart_api.h"
 
 #include "bin/builtin.h"
 #include "bin/dartutils.h"
-
+#include "bin/io_natives.h"
 
 Builtin::builtin_lib_props Builtin::builtin_libraries_[] = {
   /* { url_, source_, patch_url_, patch_source_, has_natives_ } */
   { DartUtils::kBuiltinLibURL, builtin_source_, NULL, NULL, true },
   { DartUtils::kJsonLibURL, json_source_, NULL, NULL, false },
   { DartUtils::kUriLibURL, uri_source_, NULL, NULL, false },
   { DartUtils::kCryptoLibURL, crypto_source_, NULL, NULL, false },
   { DartUtils::kIOLibURL, io_source_,
     DartUtils::kIOLibPatchURL, io_patch_, true },
   { DartUtils::kUtfLibURL, utf_source_, NULL, NULL, false }
 };
 
 
 Dart_Handle Builtin::Source(BuiltinLibraryId id) {
   ASSERT((sizeof(builtin_libraries_) / sizeof(builtin_lib_props)) ==
          kInvalidLibrary);
   ASSERT(id >= kBuiltinLibrary && id < kInvalidLibrary);
   return DartUtils::NewString(builtin_libraries_[id].source_);
 }
 
+/**
+ * Looks up native functions in both libdart_builtin and libdart_io.
+ */
+Dart_NativeFunction Builtin::NativeLookup(Dart_Handle name,
+                                          int argument_count) {
+  Dart_NativeFunction result = BuiltinNativeLookup(name, argument_count);
+  if (result != NULL) return result;
+  return IONativeLookup(name, argument_count);
+}
 
 void Builtin::SetNativeResolver(BuiltinLibraryId id) {
   UNREACHABLE();
 }
 
 
 Dart_Handle Builtin::LoadAndCheckLibrary(BuiltinLibraryId id) {
   ASSERT((sizeof(builtin_libraries_) / sizeof(builtin_lib_props)) ==
          kInvalidLibrary);
   ASSERT(id >= kBuiltinLibrary && id < kInvalidLibrary);
@@ skipping 10 matching lines @@
       Dart_Handle patch_url =
           DartUtils::NewString(builtin_libraries_[id].patch_url_);
       Dart_Handle patch_source =
           DartUtils::NewString(builtin_libraries_[id].patch_source_);
       DART_CHECK_VALID(Dart_LoadPatch(library, patch_url, patch_source));
     }
   }
   DART_CHECK_VALID(library);
   return library;
 }