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/*
* 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
}
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