Implement unions as members of structs.

mojo/public/cpp/bindings/tests/union_unittest.cc

Index: mojo/public/cpp/bindings/tests/union_unittest.cc
diff --git a/mojo/public/cpp/bindings/tests/union_unittest.cc b/mojo/public/cpp/bindings/tests/union_unittest.cc
index aba7faa6fbeaf07ebe18f86cfe548c9bf9a98efe..3ef9dc3e648494ccc15d38944d846ab49dc05a70 100644
--- a/mojo/public/cpp/bindings/tests/union_unittest.cc
+++ b/mojo/public/cpp/bindings/tests/union_unittest.cc
@@ -108,8 +108,8 @@ TEST(UnionTest, SerializationPod) {
   EXPECT_EQ(16U, size);
 
   mojo::internal::FixedBuffer buf(size);
-  internal::PodUnion_Data* data;
-  Serialize_(pod1.Pass(), &buf, &data);
+  internal::PodUnion_Data* data = nullptr;
+  SerializeUnion_(pod1.Pass(), &buf, &data, false);
 
   PodUnionPtr pod2;
   Deserialize_(data, &pod2);
@@ -119,7 +119,7 @@ TEST(UnionTest, SerializationPod) {
   EXPECT_EQ(pod2->which(), PodUnion::Tag::F_INT8);
 }
 
-TEST(UnionTest, ValidationJustWorksPod) {
+TEST(UnionTest, PodValidation) {
   PodUnionPtr pod(PodUnion::New());
   pod->set_f_int8(10);
 
@@ -127,19 +127,60 @@ TEST(UnionTest, ValidationJustWorksPod) {
   EXPECT_EQ(16U, size);
 
   mojo::internal::FixedBuffer buf(size);
-  internal::PodUnion_Data* data;
-  Serialize_(pod.Pass(), &buf, &data);
+  internal::PodUnion_Data* data = nullptr;
+  SerializeUnion_(pod.Pass(), &buf, &data, false);
   void* raw_buf = buf.Leak();
   mojo::internal::BoundsChecker bounds_checker(data,
                                                static_cast<uint32_t>(size), 0);
-  EXPECT_TRUE(internal::PodUnion_Data::Validate(raw_buf, &bounds_checker));
+  EXPECT_TRUE(
+      internal::PodUnion_Data::Validate(raw_buf, &bounds_checker, false));
   free(raw_buf);
 }
 
+TEST(UnionTest, SerializeNotNull) {
+  PodUnionPtr pod(PodUnion::New());
+  pod->set_f_int8(0);
+  size_t size = GetSerializedSize_(pod);
+  mojo::internal::FixedBuffer buf(size);
+  internal::PodUnion_Data* data = nullptr;
+  SerializeUnion_(pod.Pass(), &buf, &data, false);
+  EXPECT_FALSE(data->is_null());
+}
+
+TEST(UnionTest, SerializeIsNullInlined) {
+  PodUnionPtr pod;
+  size_t size = GetSerializedSize_(pod);
+  EXPECT_EQ(16U, size);
+  mojo::internal::FixedBuffer buf(size);
+  internal::PodUnion_Data* data = internal::PodUnion_Data::New(&buf);
+
+  // Check that dirty output buffers are handled correctly by serialization.
+  data->size = 16U;
+  data->tag = PodUnion::Tag::F_UINT16;
+  data->data.f_f_int16 = 20;
+
+  SerializeUnion_(pod.Pass(), &buf, &data, true);
+  EXPECT_TRUE(data->is_null());
+
+  PodUnionPtr pod2;
+  Deserialize_(data, &pod2);
+  EXPECT_TRUE(pod2.is_null());
+}
+
+TEST(UnionTest, SerializeIsNullNotInlined) {
+  PodUnionPtr pod;
+  size_t size = GetSerializedSize_(pod);
+  EXPECT_EQ(16U, size);
+  mojo::internal::FixedBuffer buf(size);
+  internal::PodUnion_Data* data = nullptr;
+  SerializeUnion_(pod.Pass(), &buf, &data, false);
+  EXPECT_EQ(nullptr, data);
+}
+
 TEST(UnionTest, NullValidation) {
   void* buf = nullptr;
   mojo::internal::BoundsChecker bounds_checker(buf, 0, 0);
-  EXPECT_TRUE(internal::PodUnion_Data::Validate(buf, &bounds_checker));
+  EXPECT_TRUE(internal::PodUnion_Data::Validate(buf, &bounds_checker, false));
 }
 
 TEST(UnionTest, OutOfAlignmentValidation) {
@@ -154,7 +195,7 @@ TEST(UnionTest, OutOfAlignmentValidation) {
       reinterpret_cast<internal::PodUnion_Data*>(buf);
   mojo::internal::BoundsChecker bounds_checker(data,
                                                static_cast<uint32_t>(size), 0);
-  EXPECT_FALSE(internal::PodUnion_Data::Validate(buf, &bounds_checker));
+  EXPECT_FALSE(internal::PodUnion_Data::Validate(buf, &bounds_checker, false));
   free(raw_buf);
 }
 
@@ -166,7 +207,8 @@ TEST(UnionTest, OOBValidation) {
   mojo::internal::BoundsChecker bounds_checker(data,
                                                static_cast<uint32_t>(size), 0);
   void* raw_buf = buf.Leak();
-  EXPECT_FALSE(internal::PodUnion_Data::Validate(raw_buf, &bounds_checker));
+  EXPECT_FALSE(
+      internal::PodUnion_Data::Validate(raw_buf, &bounds_checker, false));
   free(raw_buf);
 }
 
@@ -179,7 +221,8 @@ TEST(UnionTest, UnknownTagValidation) {
   mojo::internal::BoundsChecker bounds_checker(data,
                                                static_cast<uint32_t>(size), 0);
   void* raw_buf = buf.Leak();
-  EXPECT_FALSE(internal::PodUnion_Data::Validate(raw_buf, &bounds_checker));
+  EXPECT_FALSE(
+      internal::PodUnion_Data::Validate(raw_buf, &bounds_checker, false));
   free(raw_buf);
 }
 
@@ -224,8 +267,8 @@ TEST(UnionTest, StringSerialization) {
 
   size_t size = GetSerializedSize_(pod1);
   mojo::internal::FixedBuffer buf(size);
-  internal::ObjectUnion_Data* data;
-  Serialize_(pod1.Pass(), &buf, &data);
+  internal::ObjectUnion_Data* data = nullptr;
+  SerializeUnion_(pod1.Pass(), &buf, &data, false);
 
   ObjectUnionPtr pod2;
   Deserialize_(data, &pod2);
@@ -234,7 +277,7 @@ TEST(UnionTest, StringSerialization) {
   EXPECT_EQ(pod2->which(), ObjectUnion::Tag::F_STRING);
 }
 
-TEST(UnionTest, StringValidationNull) {
+TEST(UnionTest, NullStringValidation) {
   Environment environment;
   size_t size = sizeof(internal::ObjectUnion_Data);
   mojo::internal::FixedBuffer buf(size);
@@ -244,11 +287,12 @@ TEST(UnionTest, StringValidationNull) {
   mojo::internal::BoundsChecker bounds_checker(data,
                                                static_cast<uint32_t>(size), 0);
   void* raw_buf = buf.Leak();
-  EXPECT_FALSE(internal::ObjectUnion_Data::Validate(raw_buf, &bounds_checker));
+  EXPECT_FALSE(
+      internal::ObjectUnion_Data::Validate(raw_buf, &bounds_checker, false));
   free(raw_buf);
 }
 
-TEST(UnionTest, StringValidationPointerOverflow) {
+TEST(UnionTest, StringPointerOverflowValidation) {
   Environment environment;
   size_t size = sizeof(internal::ObjectUnion_Data);
   mojo::internal::FixedBuffer buf(size);
@@ -258,11 +302,12 @@ TEST(UnionTest, StringValidationPointerOverflow) {
   mojo::internal::BoundsChecker bounds_checker(data,
                                                static_cast<uint32_t>(size), 0);
   void* raw_buf = buf.Leak();
-  EXPECT_FALSE(internal::ObjectUnion_Data::Validate(raw_buf, &bounds_checker));
+  EXPECT_FALSE(
+      internal::ObjectUnion_Data::Validate(raw_buf, &bounds_checker, false));
   free(raw_buf);
 }
 
-TEST(UnionTest, StringValidationValidateString) {
+TEST(UnionTest, StringValidateOOB) {
   Environment environment;
   size_t size = 32;
   mojo::internal::FixedBuffer buf(size);
@@ -277,7 +322,8 @@ TEST(UnionTest, StringValidationValidateString) {
   array_header->num_elements = 20;
   mojo::internal::BoundsChecker bounds_checker(data, 32, 0);
   void* raw_buf = buf.Leak();
-  EXPECT_FALSE(internal::ObjectUnion_Data::Validate(raw_buf, &bounds_checker));
+  EXPECT_FALSE(
+      internal::ObjectUnion_Data::Validate(raw_buf, &bounds_checker, false));
   free(raw_buf);
 }
 }  // namespace test