feat: add dummy implementation of pretouch() for !amd64 arch (#306)

* feat: 🎸 (sonic.go): Add none implement for !amd64 arch

✅ Closes: #301

* Add test

* Address comment

compat.go

@@ -1,3 +1,4 @@
+//go:build !amd64
 // +build !amd64
 
 /*
@@ -22,6 +23,9 @@ import (
     `bytes`
     `encoding/json`
     `io`
+    `reflect`
+
+    `github.com/bytedance/sonic/option`
 )
 
 type frozenConfig struct {
@@ -114,4 +118,16 @@ func (cfg *frozenConfig) NewDecoder(reader io.Reader) Decoder {
 // Valid is implemented by sonic
 func (cfg *frozenConfig) Valid(data []byte) bool {
     return json.Valid(data)
-}
+}
+
+
+// Pretouch compiles vt ahead-of-time to avoid JIT compilation on-the-fly, in
+// order to reduce the first-hit latency at **amd64** Arch.
+// Opts are the compile options, for example, "option.WithCompileRecursiveDepth" is
+// a compile option to set the depth of recursive compile for the nested struct type.
+// * This is the none implement for !amd64.
+// It will be useful for someone who develop with !amd64 arch,like Mac M1.
+func Pretouch(vt reflect.Type, opts ...option.CompileOption) error {
+    return nil
+}
+

compat_test.go

@@ -0,0 +1,42 @@
+//go:build !amd64
+// +build !amd64
+
+/*
+ * Copyright 2022 ByteDance Inc.
+ *
+ * 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 sonic
+
+import (
+    `reflect`
+    `testing`
+
+    `github.com/bytedance/sonic/option`
+)
+
+func TestPretouch(t *testing.T) {
+    var v map[string]interface{}
+    if err := Pretouch(reflect.TypeOf(v)); err != nil {
+        t.Errorf("err:%v", err)
+    }
+
+    if err := Pretouch(reflect.TypeOf(v),
+       option.WithCompileRecursiveDepth(1),
+       option.WithCompileMaxInlineDepth(2),
+    ); err != nil {
+        t.Errorf("err:%v", err)
+    }
+}
+