实现基础web服务器

vendor/github.com/bytedance/sonic/loader/loader_go116.go

@@ -0,0 +1,104 @@
+//go:build go1.16 && !go1.21
+// +build go1.16,!go1.21
+
+/*
+ * 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 loader
+
+import (
+    `github.com/bytedance/sonic/internal/rt`
+)
+
+// LoadFuncs loads only one function as module, and returns the function pointer
+//   - text: machine code
+//   - funcName: function name
+//   - frameSize: stack frame size. 
+//   - argSize: argument total size (in bytes)
+//   - argPtrs: indicates if a slot (8 Bytes) of arguments memory stores pointer, from low to high
+//   - localPtrs: indicates if a slot (8 Bytes) of local variants memory stores pointer, from low to high
+// 
+// WARN: 
+//   - the function MUST has fixed SP offset equaling to this, otherwise it go.gentraceback will fail
+//   - the function MUST has only one stack map for all arguments and local variants
+func (self Loader) LoadOne(text []byte, funcName string, frameSize int, argSize int, argPtrs []bool, localPtrs []bool) Function {
+    size := uint32(len(text))
+
+    fn := Func{
+        Name: funcName,
+        TextSize: size,
+        ArgsSize: int32(argSize),
+    }
+
+    // NOTICE: suppose the function has fixed SP offset equaling to frameSize, thus make only one pcsp pair
+    fn.Pcsp = &Pcdata{
+        {PC: size, Val: int32(frameSize)},
+    }
+
+    if self.NoPreempt {
+        fn.PcUnsafePoint = &Pcdata{
+            {PC: size, Val: PCDATA_UnsafePointUnsafe},
+        }
+    } else {
+        fn.PcUnsafePoint = &Pcdata{
+            {PC: size, Val: PCDATA_UnsafePointSafe},
+        }
+    }
+
+    // NOTICE: suppose the function has only one stack map at index 0
+    fn.PcStackMapIndex = &Pcdata{
+        {PC: size, Val: 0},
+    }
+
+    if argPtrs != nil {
+        args := rt.StackMapBuilder{}
+        for _, b := range argPtrs {
+            args.AddField(b)
+        }
+        fn.ArgsPointerMaps = args.Build()
+    }
+    
+    if localPtrs != nil {
+        locals := rt .StackMapBuilder{}
+        for _, b := range localPtrs {
+            locals.AddField(b)
+        }
+        fn.LocalsPointerMaps = locals.Build()
+    }
+
+    out := Load(text, []Func{fn}, self.Name + funcName, []string{self.File})
+    return out[0]
+}
+
+// Load loads given machine codes and corresponding function information into go moduledata
+// and returns runnable function pointer
+// WARN: this API is experimental, use it carefully
+func Load(text []byte, funcs []Func, modulename string, filenames []string) (out []Function) {
+    // generate module data and allocate memory address
+    mod := makeModuledata(modulename, filenames, funcs, text)
+
+    // verify and register the new module
+    moduledataverify1(mod)
+    registerModule(mod)
+
+    // encapsulate function address
+    out = make([]Function, len(funcs))
+    for i, f := range funcs {
+        m := uintptr(mod.text + uintptr(f.EntryOff))
+        out[i] = Function(&m)
+    }
+    return 
+}