mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-05 00:39:59 +00:00
104 lines
3.3 KiB
Go
104 lines
3.3 KiB
Go
//go:build go1.16 && !go1.21
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// +build go1.16,!go1.21
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/*
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* Copyright 2021 ByteDance Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package loader
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import (
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`github.com/bytedance/sonic/internal/rt`
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)
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// LoadFuncs loads only one function as module, and returns the function pointer
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// - text: machine code
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// - funcName: function name
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// - frameSize: stack frame size.
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// - argSize: argument total size (in bytes)
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// - argPtrs: indicates if a slot (8 Bytes) of arguments memory stores pointer, from low to high
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// - localPtrs: indicates if a slot (8 Bytes) of local variants memory stores pointer, from low to high
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//
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// WARN:
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// - the function MUST has fixed SP offset equaling to this, otherwise it go.gentraceback will fail
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// - the function MUST has only one stack map for all arguments and local variants
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func (self Loader) LoadOne(text []byte, funcName string, frameSize int, argSize int, argPtrs []bool, localPtrs []bool) Function {
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size := uint32(len(text))
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fn := Func{
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Name: funcName,
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TextSize: size,
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ArgsSize: int32(argSize),
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}
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// NOTICE: suppose the function has fixed SP offset equaling to frameSize, thus make only one pcsp pair
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fn.Pcsp = &Pcdata{
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{PC: size, Val: int32(frameSize)},
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}
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if self.NoPreempt {
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fn.PcUnsafePoint = &Pcdata{
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{PC: size, Val: PCDATA_UnsafePointUnsafe},
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}
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} else {
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fn.PcUnsafePoint = &Pcdata{
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{PC: size, Val: PCDATA_UnsafePointSafe},
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}
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}
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// NOTICE: suppose the function has only one stack map at index 0
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fn.PcStackMapIndex = &Pcdata{
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{PC: size, Val: 0},
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}
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if argPtrs != nil {
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args := rt.StackMapBuilder{}
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for _, b := range argPtrs {
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args.AddField(b)
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}
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fn.ArgsPointerMaps = args.Build()
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}
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if localPtrs != nil {
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locals := rt .StackMapBuilder{}
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for _, b := range localPtrs {
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locals.AddField(b)
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}
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fn.LocalsPointerMaps = locals.Build()
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}
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out := Load(text, []Func{fn}, self.Name + funcName, []string{self.File})
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return out[0]
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}
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// Load loads given machine codes and corresponding function information into go moduledata
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// and returns runnable function pointer
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// WARN: this API is experimental, use it carefully
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func Load(text []byte, funcs []Func, modulename string, filenames []string) (out []Function) {
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// generate module data and allocate memory address
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mod := makeModuledata(modulename, filenames, funcs, text)
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// verify and register the new module
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moduledataverify1(mod)
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registerModule(mod)
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// encapsulate function address
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out = make([]Function, len(funcs))
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for i, f := range funcs {
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m := uintptr(mod.text + uintptr(f.EntryOff))
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out[i] = Function(&m)
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}
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return
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} |