1 files changed, 42 insertions, 0 deletions
diff --git a/golang/kati/symtab.go b/golang/kati/symtab.go
new file mode 100644
index 0000000..f8fc1f8
--- /dev/null
+++ b/golang/kati/symtab.go
@@ -0,0 +1,42 @@
+// Copyright 2015 Google Inc. All rights reserved
+//
+// 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 kati
+
+import "sync"
+
+type symtabT struct {
+	mu sync.Mutex
+	m  map[string]string
+}
+
+var symtab = &symtabT{
+	m: make(map[string]string),
+}
+
+func intern(s string) string {
+	symtab.mu.Lock()
+	v, ok := symtab.m[s]
+	if ok {
+		symtab.mu.Unlock()
+		return v
+	}
+	symtab.m[s] = s
+	symtab.mu.Unlock()
+	return s
+}
+
+func internBytes(s []byte) string {
+	return intern(string(s))
+}