go_marshal: Implement automatic generation of ABI marshalling code.

This CL implements go_marshal, a code generation utility for
automatically serializing and deserializing ABI structs.

The go_marshal tool automatically generates implementations of the new
marshal interface. Unlike binary.Marshal/Unmarshal, the generated
interface implementations use no runtime reflection, and translates to
a single memcpy for most structs. See go_marshal/README.md for
details.

PiperOrigin-RevId: 268065475

2 files changed, 34 insertions, 0 deletions

diff --git a/tools/go_marshal/test/external/BUILD b/tools/go_marshal/test/external/BUILD
new file mode 100644
index 000000000..8fb43179b
--- /dev/null
+++ b/tools/go_marshal/test/external/BUILD
@@ -0,0 +1,11 @@
+package(licenses = ["notice"])
+
+load("//tools/go_marshal:defs.bzl", "go_library")
+
+go_library(
+    name = "external",
+    testonly = 1,
+    srcs = ["external.go"],
+    importpath = "gvisor.dev/gvisor/tools/go_marshal/test/external",
+    visibility = ["//tools/go_marshal/test:gomarshal_test"],
+)
diff --git a/tools/go_marshal/test/external/external.go b/tools/go_marshal/test/external/external.go
new file mode 100644
index 000000000..4be3722f3
--- /dev/null
+++ b/tools/go_marshal/test/external/external.go
@@ -0,0 +1,23 @@
+// Copyright 2019 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package external defines types we can import for testing.
+package external
+
+// External is a public Marshallable type for use in testing.
+//
+// +marshal
+type External struct {
+	j int64
+}