Add vendor to improve building speed.

This also adds ability to be built in network-constrained environment.

vendor/github.com/bytedance/sonic/option/option.go

@@ -0,0 +1,86 @@
+/*
+ * Copyright 2021 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 option
+
+var (
+    // DefaultDecoderBufferSize is the initial buffer size of StreamDecoder
+    DefaultDecoderBufferSize  uint = 128 * 1024
+
+    // DefaultEncoderBufferSize is the initial buffer size of Encoder
+    DefaultEncoderBufferSize  uint = 128 * 1024
+)
+
+// CompileOptions includes all options for encoder or decoder compiler.
+type CompileOptions struct {
+    // the maximum depth for compilation inline
+    MaxInlineDepth int
+
+    // the loop times for recursively pretouch
+    RecursiveDepth int
+}
+
+var (
+    // Default value(3) means the compiler only inline 3 layers of nested struct. 
+    // when the depth exceeds, the compiler will recurse 
+    // and compile subsequent structs when they are decoded 
+    DefaultMaxInlineDepth = 3
+
+    // Default value(1) means `Pretouch()` will be recursively executed once,
+    // if any nested struct is left (depth exceeds MaxInlineDepth)
+    DefaultRecursiveDepth = 1
+)
+
+// DefaultCompileOptions set default compile options.
+func DefaultCompileOptions() CompileOptions {
+    return CompileOptions{
+        RecursiveDepth: DefaultRecursiveDepth,
+        MaxInlineDepth: DefaultMaxInlineDepth,
+    }
+}
+
+// CompileOption is a function used to change DefaultCompileOptions.
+type CompileOption func(o *CompileOptions)
+
+// WithCompileRecursiveDepth sets the loop times of recursive pretouch 
+// in both decoder and encoder,
+// for both concrete type and its pointer type.
+//
+// For deep nested struct (depth exceeds MaxInlineDepth), 
+// try to set more loops to completely compile, 
+// thus reduce JIT unstability in the first hit.
+func WithCompileRecursiveDepth(loop int) CompileOption {
+    return func(o *CompileOptions) {
+            if loop < 0 {
+                panic("loop must be >= 0")
+            }
+            o.RecursiveDepth = loop
+        }
+}
+
+// WithCompileMaxInlineDepth sets the max depth of inline compile 
+// in decoder and encoder.
+//
+// For large nested struct, try to set smaller depth to reduce compiling time.
+func WithCompileMaxInlineDepth(depth int) CompileOption {
+    return func(o *CompileOptions) {
+            if depth <= 0 {
+                panic("depth must be > 0")
+            }
+            o.MaxInlineDepth = depth
+        }
+}
+