Support anonymous structs in checklocks.

Fixes #6558

PiperOrigin-RevId: 396393293

2 files changed, 36 insertions, 0 deletions

diff --git a/tools/checklocks/test/BUILD b/tools/checklocks/test/BUILD
index 966bbac22..d4d98c256 100644
--- a/tools/checklocks/test/BUILD
+++ b/tools/checklocks/test/BUILD
@@ -6,6 +6,7 @@ go_library(
     name = "test",
     srcs = [
         "alignment.go",
+        "anon.go",
         "atomics.go",
         "basics.go",
         "branches.go",
diff --git a/tools/checklocks/test/anon.go b/tools/checklocks/test/anon.go
new file mode 100644
index 000000000..a1f6bddda
--- /dev/null
+++ b/tools/checklocks/test/anon.go
@@ -0,0 +1,35 @@
+// Copyright 2021 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 test
+
+import "sync"
+
+type anonStruct struct {
+	anon struct {
+		mu sync.RWMutex
+		// +checklocks:mu
+		x int
+	}
+}
+
+func testAnonAccessValid(tc *anonStruct) {
+	tc.anon.mu.Lock()
+	tc.anon.x = 1
+	tc.anon.mu.Unlock()
+}
+
+func testAnonAccessInvalid(tc *anonStruct) {
+	tc.anon.x = 1 // +checklocksfail
+}