mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-27 14:16:39 +00:00
270 lines
7.2 KiB
Go
270 lines
7.2 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 (
|
|
`encoding/binary`
|
|
`strconv`
|
|
`strings`
|
|
`sync`
|
|
|
|
`github.com/bytedance/sonic/loader`
|
|
`github.com/bytedance/sonic/internal/rt`
|
|
`github.com/twitchyliquid64/golang-asm/obj`
|
|
`github.com/twitchyliquid64/golang-asm/obj/x86`
|
|
)
|
|
|
|
const (
|
|
_LB_jump_pc = "_jump_pc_"
|
|
)
|
|
|
|
type BaseAssembler struct {
|
|
i int
|
|
f func()
|
|
c []byte
|
|
o sync.Once
|
|
pb *Backend
|
|
xrefs map[string][]*obj.Prog
|
|
labels map[string]*obj.Prog
|
|
pendings map[string][]*obj.Prog
|
|
}
|
|
|
|
/** Instruction Encoders **/
|
|
|
|
var _NOPS = [][16]byte {
|
|
{0x90}, // NOP
|
|
{0x66, 0x90}, // 66 NOP
|
|
{0x0f, 0x1f, 0x00}, // NOP DWORD ptr [EAX]
|
|
{0x0f, 0x1f, 0x40, 0x00}, // NOP DWORD ptr [EAX + 00H]
|
|
{0x0f, 0x1f, 0x44, 0x00, 0x00}, // NOP DWORD ptr [EAX + EAX*1 + 00H]
|
|
{0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00}, // 66 NOP DWORD ptr [EAX + EAX*1 + 00H]
|
|
{0x0f, 0x1f, 0x80, 0x00, 0x00, 0x00, 0x00}, // NOP DWORD ptr [EAX + 00000000H]
|
|
{0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00}, // NOP DWORD ptr [EAX + EAX*1 + 00000000H]
|
|
{0x66, 0x0f, 0x1f, 0x84, 0x00, 0x00, 0x00, 0x00, 0x00}, // 66 NOP DWORD ptr [EAX + EAX*1 + 00000000H]
|
|
}
|
|
|
|
func (self *BaseAssembler) NOP() *obj.Prog {
|
|
p := self.pb.New()
|
|
p.As = obj.ANOP
|
|
self.pb.Append(p)
|
|
return p
|
|
}
|
|
|
|
func (self *BaseAssembler) NOPn(n int) {
|
|
for i := len(_NOPS); i > 0 && n > 0; i-- {
|
|
for ; n >= i; n -= i {
|
|
self.Byte(_NOPS[i - 1][:i]...)
|
|
}
|
|
}
|
|
}
|
|
|
|
func (self *BaseAssembler) Byte(v ...byte) {
|
|
for ; len(v) >= 8; v = v[8:] { self.From("QUAD", Imm(rt.Get64(v))) }
|
|
for ; len(v) >= 4; v = v[4:] { self.From("LONG", Imm(int64(rt.Get32(v)))) }
|
|
for ; len(v) >= 2; v = v[2:] { self.From("WORD", Imm(int64(rt.Get16(v)))) }
|
|
for ; len(v) >= 1; v = v[1:] { self.From("BYTE", Imm(int64(v[0]))) }
|
|
}
|
|
|
|
func (self *BaseAssembler) Mark(pc int) {
|
|
self.i++
|
|
self.Link(_LB_jump_pc + strconv.Itoa(pc))
|
|
}
|
|
|
|
func (self *BaseAssembler) Link(to string) {
|
|
var p *obj.Prog
|
|
var v []*obj.Prog
|
|
|
|
/* placeholder substitution */
|
|
if strings.Contains(to, "{n}") {
|
|
to = strings.ReplaceAll(to, "{n}", strconv.Itoa(self.i))
|
|
}
|
|
|
|
/* check for duplications */
|
|
if _, ok := self.labels[to]; ok {
|
|
panic("label " + to + " has already been linked")
|
|
}
|
|
|
|
/* get the pending links */
|
|
p = self.NOP()
|
|
v = self.pendings[to]
|
|
|
|
/* patch all the pending jumps */
|
|
for _, q := range v {
|
|
q.To.Val = p
|
|
}
|
|
|
|
/* mark the label as resolved */
|
|
self.labels[to] = p
|
|
delete(self.pendings, to)
|
|
}
|
|
|
|
func (self *BaseAssembler) Xref(pc int, d int64) {
|
|
self.Sref(_LB_jump_pc + strconv.Itoa(pc), d)
|
|
}
|
|
|
|
func (self *BaseAssembler) Sref(to string, d int64) {
|
|
p := self.pb.New()
|
|
p.As = x86.ALONG
|
|
p.From = Imm(-d)
|
|
|
|
/* placeholder substitution */
|
|
if strings.Contains(to, "{n}") {
|
|
to = strings.ReplaceAll(to, "{n}", strconv.Itoa(self.i))
|
|
}
|
|
|
|
/* record the patch point */
|
|
self.pb.Append(p)
|
|
self.xrefs[to] = append(self.xrefs[to], p)
|
|
}
|
|
|
|
func (self *BaseAssembler) Xjmp(op string, to int) {
|
|
self.Sjmp(op, _LB_jump_pc + strconv.Itoa(to))
|
|
}
|
|
|
|
func (self *BaseAssembler) Sjmp(op string, to string) {
|
|
p := self.pb.New()
|
|
p.As = As(op)
|
|
|
|
/* placeholder substitution */
|
|
if strings.Contains(to, "{n}") {
|
|
to = strings.ReplaceAll(to, "{n}", strconv.Itoa(self.i))
|
|
}
|
|
|
|
/* check for backward jumps */
|
|
if v, ok := self.labels[to]; ok {
|
|
p.To.Val = v
|
|
} else {
|
|
self.pendings[to] = append(self.pendings[to], p)
|
|
}
|
|
|
|
/* mark as a branch, and add to instruction buffer */
|
|
p.To.Type = obj.TYPE_BRANCH
|
|
self.pb.Append(p)
|
|
}
|
|
|
|
func (self *BaseAssembler) Rjmp(op string, to obj.Addr) {
|
|
p := self.pb.New()
|
|
p.To = to
|
|
p.As = As(op)
|
|
self.pb.Append(p)
|
|
}
|
|
|
|
func (self *BaseAssembler) From(op string, val obj.Addr) {
|
|
p := self.pb.New()
|
|
p.As = As(op)
|
|
p.From = val
|
|
self.pb.Append(p)
|
|
}
|
|
|
|
func (self *BaseAssembler) Emit(op string, args ...obj.Addr) {
|
|
p := self.pb.New()
|
|
p.As = As(op)
|
|
self.assignOperands(p, args)
|
|
self.pb.Append(p)
|
|
}
|
|
|
|
func (self *BaseAssembler) assignOperands(p *obj.Prog, args []obj.Addr) {
|
|
switch len(args) {
|
|
case 0 :
|
|
case 1 : p.To = args[0]
|
|
case 2 : p.To, p.From = args[1], args[0]
|
|
case 3 : p.To, p.From, p.RestArgs = args[2], args[0], args[1:2]
|
|
case 4 : p.To, p.From, p.RestArgs = args[2], args[3], args[:2]
|
|
default : panic("invalid operands")
|
|
}
|
|
}
|
|
|
|
/** Assembler Helpers **/
|
|
|
|
func (self *BaseAssembler) Size() int {
|
|
self.build()
|
|
return len(self.c)
|
|
}
|
|
|
|
func (self *BaseAssembler) Init(f func()) {
|
|
self.i = 0
|
|
self.f = f
|
|
self.c = nil
|
|
self.o = sync.Once{}
|
|
}
|
|
|
|
var jitLoader = loader.Loader{
|
|
Name: "sonic.jit.",
|
|
File: "github.com/bytedance/sonic/jit.go",
|
|
Options: loader.Options{
|
|
NoPreempt: true,
|
|
},
|
|
}
|
|
|
|
func (self *BaseAssembler) Load(name string, frameSize int, argSize int, argStackmap []bool, localStackmap []bool) loader.Function {
|
|
self.build()
|
|
return jitLoader.LoadOne(self.c, name, frameSize, argSize, argStackmap, localStackmap)
|
|
}
|
|
|
|
/** Assembler Stages **/
|
|
|
|
func (self *BaseAssembler) init() {
|
|
self.pb = newBackend("amd64")
|
|
self.xrefs = map[string][]*obj.Prog{}
|
|
self.labels = map[string]*obj.Prog{}
|
|
self.pendings = map[string][]*obj.Prog{}
|
|
}
|
|
|
|
func (self *BaseAssembler) build() {
|
|
self.o.Do(func() {
|
|
self.init()
|
|
self.f()
|
|
self.validate()
|
|
self.assemble()
|
|
self.resolve()
|
|
self.release()
|
|
})
|
|
}
|
|
|
|
func (self *BaseAssembler) release() {
|
|
self.pb.Release()
|
|
self.pb = nil
|
|
self.xrefs = nil
|
|
self.labels = nil
|
|
self.pendings = nil
|
|
}
|
|
|
|
func (self *BaseAssembler) resolve() {
|
|
for s, v := range self.xrefs {
|
|
for _, prog := range v {
|
|
if prog.As != x86.ALONG {
|
|
panic("invalid RIP relative reference")
|
|
} else if p, ok := self.labels[s]; !ok {
|
|
panic("links are not fully resolved: " + s)
|
|
} else {
|
|
off := prog.From.Offset + p.Pc - prog.Pc
|
|
binary.LittleEndian.PutUint32(self.c[prog.Pc:], uint32(off))
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func (self *BaseAssembler) validate() {
|
|
for key := range self.pendings {
|
|
panic("links are not fully resolved: " + key)
|
|
}
|
|
}
|
|
|
|
func (self *BaseAssembler) assemble() {
|
|
self.c = self.pb.Assemble()
|
|
}
|