Minor checklocks improvements.

* Support sync.Locker.
* Prevent runaway recursion when locks are acquired in a loop.
* Allowing ignoring of anonymous functions (inherited from parent function).
* Add support for aliases.

PiperOrigin-RevId: 407221521

1 files changed, 26 insertions, 0 deletions

diff --git a/tools/checklocks/test/aliases.go b/tools/checklocks/test/aliases.go
new file mode 100644
index 000000000..e28027fe5
--- /dev/null
+++ b/tools/checklocks/test/aliases.go
@@ -0,0 +1,26 @@
+// 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
+
+// +checklocks:tc.mu
+// +checklocksalias:tc2.mu=tc.mu
+func testAliasValid(tc *oneGuardStruct, tc2 *oneGuardStruct) {
+	tc2.guardedField = 1
+}
+
+// +checklocks:tc.mu
+func testAliasInvalid(tc *oneGuardStruct, tc2 *oneGuardStruct) {
+	tc2.guardedField = 1 // +checklocksfail
+}