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//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
}
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