You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
121 lines
2.6 KiB
Go
121 lines
2.6 KiB
Go
/*
|
|
* 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 jit
|
|
|
|
import (
|
|
`fmt`
|
|
`sync`
|
|
_ `unsafe`
|
|
|
|
`github.com/twitchyliquid64/golang-asm/asm/arch`
|
|
`github.com/twitchyliquid64/golang-asm/obj`
|
|
`github.com/twitchyliquid64/golang-asm/objabi`
|
|
)
|
|
|
|
type Backend struct {
|
|
Ctxt *obj.Link
|
|
Arch *arch.Arch
|
|
Head *obj.Prog
|
|
Tail *obj.Prog
|
|
Prog []*obj.Prog
|
|
}
|
|
|
|
var (
|
|
_progPool sync.Pool
|
|
)
|
|
|
|
//go:nosplit
|
|
//go:linkname throw runtime.throw
|
|
func throw(_ string)
|
|
|
|
func newProg() *obj.Prog {
|
|
if val := _progPool.Get(); val == nil {
|
|
return new(obj.Prog)
|
|
} else {
|
|
return remProg(val.(*obj.Prog))
|
|
}
|
|
}
|
|
|
|
func remProg(p *obj.Prog) *obj.Prog {
|
|
*p = obj.Prog{}
|
|
return p
|
|
}
|
|
|
|
func newBackend(name string) (ret *Backend) {
|
|
ret = new(Backend)
|
|
ret.Arch = arch.Set(name)
|
|
ret.Ctxt = newLinkContext(ret.Arch.LinkArch)
|
|
ret.Arch.Init(ret.Ctxt)
|
|
return
|
|
}
|
|
|
|
func newLinkContext(arch *obj.LinkArch) (ret *obj.Link) {
|
|
ret = obj.Linknew(arch)
|
|
ret.Headtype = objabi.Hlinux
|
|
ret.DiagFunc = diagLinkContext
|
|
return
|
|
}
|
|
|
|
func diagLinkContext(str string, args ...interface{}) {
|
|
throw(fmt.Sprintf(str, args...))
|
|
}
|
|
|
|
func (self *Backend) New() (ret *obj.Prog) {
|
|
ret = newProg()
|
|
ret.Ctxt = self.Ctxt
|
|
self.Prog = append(self.Prog, ret)
|
|
return
|
|
}
|
|
|
|
func (self *Backend) Append(p *obj.Prog) {
|
|
if self.Head == nil {
|
|
self.Head = p
|
|
self.Tail = p
|
|
} else {
|
|
self.Tail.Link = p
|
|
self.Tail = p
|
|
}
|
|
}
|
|
|
|
func (self *Backend) Release() {
|
|
self.Arch = nil
|
|
self.Ctxt = nil
|
|
|
|
/* return all the progs into pool */
|
|
for _, p := range self.Prog {
|
|
_progPool.Put(p)
|
|
}
|
|
|
|
/* clear all the references */
|
|
self.Head = nil
|
|
self.Tail = nil
|
|
self.Prog = nil
|
|
}
|
|
|
|
func (self *Backend) Assemble() []byte {
|
|
var sym obj.LSym
|
|
var fnv obj.FuncInfo
|
|
|
|
/* construct the function */
|
|
sym.Func = &fnv
|
|
fnv.Text = self.Head
|
|
|
|
/* call the assembler */
|
|
self.Arch.Assemble(self.Ctxt, &sym, self.New)
|
|
return sym.P
|
|
}
|