Implement native _List. constructor in the flow-graph builder.

runtime/lib/array.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 "platform/assert.h"
 #include "vm/bootstrap_natives.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
 #include "vm/exceptions.h"
 #include "vm/native_entry.h"
 #include "vm/object.h"
 
 namespace dart {
 
 DEFINE_NATIVE_ENTRY(List_allocate, 2) {
-  const TypeArguments& type_arguments =
-      TypeArguments::CheckedHandle(isolate, arguments->NativeArgAt(0));
-  const Instance& length = Instance::CheckedHandle(
-      isolate, arguments->NativeArgAt(1));
-  if (!length.IsSmi()) {
-    const String& error = String::Handle(String::NewFormatted(
-        "Length must be an integer in the range [0..%" Pd "].",
-        Array::kMaxElements));
-    Exceptions::ThrowArgumentError(error);
-  }
-  intptr_t len = Smi::Cast(length).Value();
-  if (len < 0 || len > Array::kMaxElements) {
-    const String& error = String::Handle(String::NewFormatted(
-        "Length (%" Pd ") must be an integer in the range [0..%" Pd "].",
-        len, Array::kMaxElements));
-    Exceptions::ThrowArgumentError(error);
-  }
-  const Array& new_array = Array::Handle(Array::New(len));
-  new_array.SetTypeArguments(type_arguments);
-  return new_array.raw();
+  // Implemented in FlowGraphBuilder::VisitNativeBody.
+  UNREACHABLE();
+  return Object::null();
 }
 
 
 DEFINE_NATIVE_ENTRY(List_getIndexed, 2) {
   const Array& array = Array::CheckedHandle(arguments->NativeArgAt(0));
   GET_NON_NULL_NATIVE_ARGUMENT(Smi, index, arguments->NativeArgAt(1));
   if ((index.Value() < 0) || (index.Value() >= array.Length())) {
     const Array& args = Array::Handle(Array::New(1));
     args.SetAt(0, index);
     Exceptions::ThrowByType(Exceptions::kRange, args);
@@ skipping 77 matching lines @@
   Object& temp = Object::Handle();
   for (intptr_t i = 0; i < length; i++) {
     temp = from_array.At(i + offset);
     result.SetAt(i, temp);
   }
   result.MakeImmutable();
   return result.raw();
 }
 
 }  // namespace dart