Add an external array type to support typed arrays.

runtime/vm/object_test.cc

Index: runtime/vm/object_test.cc
diff --git a/runtime/vm/object_test.cc b/runtime/vm/object_test.cc
index aa4efb2973089a81fc588d7590eb7fc95a2eff61..5d79b0840eb967b1f2a358d24b9d2d0aeb961222 100644
--- a/runtime/vm/object_test.cc
+++ b/runtime/vm/object_test.cc
@@ -1592,6 +1592,61 @@ TEST_CASE(Array) {
 }
 
 
+TEST_CASE(ByteBuffer) {
+  uint8_t data[] = { 253, 254, 255, 0, 1, 2, 3, 4 };
+  intptr_t data_length = ARRAY_SIZE(data);
+
+  const ByteBuffer& array1 =
+      ByteBuffer::Handle(ByteBuffer::New(data, data_length));
+  EXPECT(!array1.IsNull());
+  EXPECT_EQ(data_length, array1.Length());
+  EXPECT_EQ(-3, array1.At<int8_t>(0));
+  EXPECT_EQ(253, array1.At<uint8_t>(0));
+  EXPECT_EQ(-2, array1.At<int8_t>(1));
+  EXPECT_EQ(254, array1.At<uint8_t>(1));
+  EXPECT_EQ(-1, array1.At<int8_t>(2));
+  EXPECT_EQ(255, array1.At<uint8_t>(2));
+  EXPECT_EQ(0, array1.At<int8_t>(3));
+  EXPECT_EQ(0, array1.At<uint8_t>(3));
+  EXPECT_EQ(1, array1.At<int8_t>(4));
+  EXPECT_EQ(1, array1.At<uint8_t>(4));
+  EXPECT_EQ(2, array1.At<int8_t>(5));
+  EXPECT_EQ(2, array1.At<uint8_t>(5));
+
+  const ByteBuffer& array2 =
+      ByteBuffer::Handle(ByteBuffer::New(data, data_length));
+  EXPECT(!array1.IsNull());
+  EXPECT_EQ(data_length, array2.Length());
+  EXPECT(array1.Equals(array2));
+  EXPECT(array2.Equals(array1));
+  array1.SetAt<uint8_t>(0, 123);
+  array2.SetAt<int8_t>(2, -123);
+  EXPECT(array1.Equals(array2));
+  EXPECT(array2.Equals(array1));
+
+  memset(data, 0, ARRAY_SIZE(data));
+  array1.SetAt<float>(0, FLT_MIN);
+  array1.SetAt<float>(1, FLT_MAX);
+  EXPECT_EQ(FLT_MIN, array2.At<float>(0));
+  EXPECT_EQ(FLT_MAX, array2.At<float>(1));
+
+  array1.SetAt<float>(0, 0.0f);
+  EXPECT_EQ(0.0f, array2.At<float>(0));
+  array1.SetAt<float>(1, 1.0f);
+  EXPECT_EQ(1.0f, array2.At<float>(1));
+
+  array1.SetAt<double>(0, DBL_MIN);
+  EXPECT_EQ(DBL_MIN, array2.At<double>(0));
+  array1.SetAt<double>(0, DBL_MAX);
+  EXPECT_EQ(DBL_MAX, array2.At<double>(0));
+
+  array1.SetAt<double>(0, 0.0);
+  EXPECT_EQ(0.0, array2.At<double>(0));
+  array1.SetAt<double>(0, 1.0);
+  EXPECT_EQ(1.0, array2.At<double>(0));
+}
+
+
 TEST_CASE(Script) {
   const char* url_chars = "builtin:test-case";
   const char* source_chars = "This will not compile.";