init repo

vendor/github.com/cloudwego/iasm/expr/pools.go

@@ -0,0 +1,42 @@
+//
+// Copyright 2024 CloudWeGo 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 expr
+
+import (
+    `sync`
+)
+
+var (
+    expressionPool sync.Pool
+)
+
+func newExpression() *Expr {
+    if v := expressionPool.Get(); v == nil {
+        return new(Expr)
+    } else {
+        return resetExpression(v.(*Expr))
+    }
+}
+
+func freeExpression(p *Expr) {
+    expressionPool.Put(p)
+}
+
+func resetExpression(p *Expr) *Expr {
+    *p = Expr{}
+    return p
+}