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loader_go116.go (3370B)

      1 //go:build go1.16 && !go1.21
      2 // +build go1.16,!go1.21
      3 
      4 /*
      5  * Copyright 2021 ByteDance Inc.
      6  *
      7  * Licensed under the Apache License, Version 2.0 (the "License");
      8  * you may not use this file except in compliance with the License.
      9  * You may obtain a copy of the License at
     10  *
     11  *     http://www.apache.org/licenses/LICENSE-2.0
     12  *
     13  * Unless required by applicable law or agreed to in writing, software
     14  * distributed under the License is distributed on an "AS IS" BASIS,
     15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     16  * See the License for the specific language governing permissions and
     17  * limitations under the License.
     18  */
     19 
     20 package loader
     21 
     22 import (
     23     `github.com/bytedance/sonic/internal/rt`
     24 )
     25 
     26 // LoadFuncs loads only one function as module, and returns the function pointer
     27 //   - text: machine code
     28 //   - funcName: function name
     29 //   - frameSize: stack frame size. 
     30 //   - argSize: argument total size (in bytes)
     31 //   - argPtrs: indicates if a slot (8 Bytes) of arguments memory stores pointer, from low to high
     32 //   - localPtrs: indicates if a slot (8 Bytes) of local variants memory stores pointer, from low to high
     33 // 
     34 // WARN: 
     35 //   - the function MUST has fixed SP offset equaling to this, otherwise it go.gentraceback will fail
     36 //   - the function MUST has only one stack map for all arguments and local variants
     37 func (self Loader) LoadOne(text []byte, funcName string, frameSize int, argSize int, argPtrs []bool, localPtrs []bool) Function {
     38     size := uint32(len(text))
     39 
     40     fn := Func{
     41         Name: funcName,
     42         TextSize: size,
     43         ArgsSize: int32(argSize),
     44     }
     45 
     46     // NOTICE: suppose the function has fixed SP offset equaling to frameSize, thus make only one pcsp pair
     47     fn.Pcsp = &Pcdata{
     48         {PC: size, Val: int32(frameSize)},
     49     }
     50 
     51     if self.NoPreempt {
     52         fn.PcUnsafePoint = &Pcdata{
     53             {PC: size, Val: PCDATA_UnsafePointUnsafe},
     54         }
     55     } else {
     56         fn.PcUnsafePoint = &Pcdata{
     57             {PC: size, Val: PCDATA_UnsafePointSafe},
     58         }
     59     }
     60 
     61     // NOTICE: suppose the function has only one stack map at index 0
     62     fn.PcStackMapIndex = &Pcdata{
     63         {PC: size, Val: 0},
     64     }
     65 
     66     if argPtrs != nil {
     67         args := rt.StackMapBuilder{}
     68         for _, b := range argPtrs {
     69             args.AddField(b)
     70         }
     71         fn.ArgsPointerMaps = args.Build()
     72     }
     73     
     74     if localPtrs != nil {
     75         locals := rt .StackMapBuilder{}
     76         for _, b := range localPtrs {
     77             locals.AddField(b)
     78         }
     79         fn.LocalsPointerMaps = locals.Build()
     80     }
     81 
     82     out := Load(text, []Func{fn}, self.Name + funcName, []string{self.File})
     83     return out[0]
     84 }
     85 
     86 // Load loads given machine codes and corresponding function information into go moduledata
     87 // and returns runnable function pointer
     88 // WARN: this API is experimental, use it carefully
     89 func Load(text []byte, funcs []Func, modulename string, filenames []string) (out []Function) {
     90     // generate module data and allocate memory address
     91     mod := makeModuledata(modulename, filenames, funcs, text)
     92 
     93     // verify and register the new module
     94     moduledataverify1(mod)
     95     registerModule(mod)
     96 
     97     // encapsulate function address
     98     out = make([]Function, len(funcs))
     99     for i, f := range funcs {
    100         m := uintptr(mod.text + uintptr(f.EntryOff))
    101         out[i] = Function(&m)
    102     }
    103     return 
    104 }