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emu.go
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emu.go
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/*
* Copyright 2022 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 emu
import (
`fmt`
`math/bits`
`runtime`
`sync`
`unsafe`
`github.com/cloudwego/frugal/internal/atm/hir`
)
type Value struct {
U uint64
P unsafe.Pointer
}
type Emulator struct {
pc *hir.Ir
uv [6]uint64
pv [7]unsafe.Pointer
ar [8]Value
rv [8]Value
}
var (
emulatorPool sync.Pool
)
func LoadProgram(p hir.Program) (e *Emulator) {
if v := emulatorPool.Get(); v == nil {
return &Emulator{pc: p.Head}
} else {
return v.(*Emulator).Reset(p)
}
}
func bool2u64(val bool) uint64 {
if val {
return 1
} else {
return 0
}
}
func checkptr(p unsafe.Pointer) unsafe.Pointer {
if p != nil { _ = *(*uint8)(p) }
return p
}
func (self *Emulator) trap() {
println("****** DEBUGGER BREAK ******")
println("Current State:", self.String())
runtime.Breakpoint()
}
func (self *Emulator) Ru(i int) uint64 { return self.rv[i].U }
func (self *Emulator) Rp(i int) unsafe.Pointer { return self.rv[i].P }
func (self *Emulator) Au(i int, v uint64) *Emulator { self.ar[i].U = v; return self }
func (self *Emulator) Ap(i int, v unsafe.Pointer) *Emulator { self.ar[i].P = v; return self }
func (self *Emulator) Run() {
var i uint8
var v uint64
var p *hir.Ir
var q *hir.Ir
/* run until end */
for self.pc != nil {
p, self.pc = self.pc, self.pc.Ln
self.uv[hir.Rz], self.pv[hir.Pn] = 0, nil
/* main switch on OpCode */
switch p.Op {
case hir.OP_nop : break
case hir.OP_ip : self.pv[p.Pd] = checkptr(p.Pr)
case hir.OP_lb : self.uv[p.Rx] = uint64(*(*uint8)(unsafe.Pointer(uintptr(self.pv[p.Ps]) + uintptr(p.Iv))))
case hir.OP_lw : self.uv[p.Rx] = uint64(*(*uint16)(unsafe.Pointer(uintptr(self.pv[p.Ps]) + uintptr(p.Iv))))
case hir.OP_ll : self.uv[p.Rx] = uint64(*(*uint32)(unsafe.Pointer(uintptr(self.pv[p.Ps]) + uintptr(p.Iv))))
case hir.OP_lq : self.uv[p.Rx] = *(*uint64)(unsafe.Pointer(uintptr(self.pv[p.Ps]) + uintptr(p.Iv)))
case hir.OP_lp : self.pv[p.Pd] = checkptr(*(*unsafe.Pointer)(unsafe.Pointer(uintptr(self.pv[p.Ps]) + uintptr(p.Iv))))
case hir.OP_sb : *(*uint8)(unsafe.Pointer(uintptr(self.pv[p.Pd]) + uintptr(p.Iv))) = uint8(self.uv[p.Rx])
case hir.OP_sw : *(*uint16)(unsafe.Pointer(uintptr(self.pv[p.Pd]) + uintptr(p.Iv))) = uint16(self.uv[p.Rx])
case hir.OP_sl : *(*uint32)(unsafe.Pointer(uintptr(self.pv[p.Pd]) + uintptr(p.Iv))) = uint32(self.uv[p.Rx])
case hir.OP_sq : *(*uint64)(unsafe.Pointer(uintptr(self.pv[p.Pd]) + uintptr(p.Iv))) = self.uv[p.Rx]
case hir.OP_sp : *(*unsafe.Pointer)(unsafe.Pointer(uintptr(self.pv[p.Pd]) + uintptr(p.Iv))) = self.pv[p.Ps]
case hir.OP_ldaq : self.uv[p.Rx] = self.ar[p.Iv].U
case hir.OP_ldap : self.pv[p.Pd] = checkptr(self.ar[p.Iv].P)
case hir.OP_addp : self.pv[p.Pd] = checkptr(unsafe.Pointer(uintptr(self.pv[p.Ps]) + uintptr(self.uv[p.Rx])))
case hir.OP_subp : self.pv[p.Pd] = checkptr(unsafe.Pointer(uintptr(self.pv[p.Ps]) - uintptr(self.uv[p.Rx])))
case hir.OP_addpi : self.pv[p.Pd] = checkptr(unsafe.Pointer(uintptr(self.pv[p.Ps]) + uintptr(p.Iv)))
case hir.OP_add : self.uv[p.Rz] = self.uv[p.Rx] + self.uv[p.Ry]
case hir.OP_sub : self.uv[p.Rz] = self.uv[p.Rx] - self.uv[p.Ry]
case hir.OP_addi : self.uv[p.Ry] = self.uv[p.Rx] + uint64(p.Iv)
case hir.OP_muli : self.uv[p.Ry] = self.uv[p.Rx] * uint64(p.Iv)
case hir.OP_andi : self.uv[p.Ry] = self.uv[p.Rx] & uint64(p.Iv)
case hir.OP_xori : self.uv[p.Ry] = self.uv[p.Rx] ^ uint64(p.Iv)
case hir.OP_shri : self.uv[p.Ry] = self.uv[p.Rx] >> p.Iv
case hir.OP_bsi : self.uv[p.Ry] = self.uv[p.Rx] | (1 << p.Iv)
case hir.OP_swapw : self.uv[p.Ry] = uint64(bits.ReverseBytes16(uint16(self.uv[p.Rx])))
case hir.OP_swapl : self.uv[p.Ry] = uint64(bits.ReverseBytes32(uint32(self.uv[p.Rx])))
case hir.OP_swapq : self.uv[p.Ry] = bits.ReverseBytes64(self.uv[p.Rx])
case hir.OP_sxlq : self.uv[p.Ry] = uint64(int32(self.uv[p.Rx]))
case hir.OP_beq : if self.uv[p.Rx] == self.uv[p.Ry] { self.pc = p.Br }
case hir.OP_bne : if self.uv[p.Rx] != self.uv[p.Ry] { self.pc = p.Br }
case hir.OP_blt : if int64(self.uv[p.Rx]) < int64(self.uv[p.Ry]) { self.pc = p.Br }
case hir.OP_bltu : if self.uv[p.Rx] < self.uv[p.Ry] { self.pc = p.Br }
case hir.OP_bgeu : if self.uv[p.Rx] >= self.uv[p.Ry] { self.pc = p.Br }
case hir.OP_beqp : if self.pv[p.Ps] == self.pv[p.Pd] { self.pc = p.Br }
case hir.OP_bnep : if self.pv[p.Ps] != self.pv[p.Pd] { self.pc = p.Br }
case hir.OP_jmp : self.pc = p.Br
case hir.OP_bzero : memclrNoHeapPointers(self.pv[p.Pd], uintptr(p.Iv))
case hir.OP_bcopy : memmove(self.pv[p.Pd], self.pv[p.Ps], uintptr(self.uv[p.Rx]))
case hir.OP_break : self.trap()
/* call to C / Go / Go interface functions */
case hir.OP_ccall: fallthrough
case hir.OP_gcall: fallthrough
case hir.OP_icall: hir.LookupCall(p.Iv).Call(self, p)
/* bit test and set */
case hir.OP_bts: {
bi := self.uv[p.Rx]
bv := self.uv[p.Ry]
self.uv[p.Ry] = bv | (1 << (bi % 64))
self.uv[p.Rz] = bool2u64(bv & (1 << (bi % 64)) != 0)
}
/* table switch */
case hir.OP_bsw: {
if v = self.uv[p.Rx]; v < uint64(p.Iv) {
if q = *(**hir.Ir)(unsafe.Pointer(uintptr(p.Pr) + uintptr(v) * 8)); q != nil {
self.pc = q
}
}
}
/* return from function */
case hir.OP_ret: {
for i, self.pc = 0, nil; i < p.Rn; i++ {
if r := p.Rr[i]; r & hir.ArgPointer == 0 {
self.rv[i].U = self.uv[r & hir.ArgMask]
} else {
self.rv[i].P = self.pv[r & hir.ArgMask]
}
}
}
/* illegal OpCode */
default: {
panic(fmt.Sprintf("illegal OpCode: %#02x", p.Op))
}
}
}
}
func (self *Emulator) Free() {
emulatorPool.Put(self)
}
func (self *Emulator) Reset(p hir.Program) *Emulator {
*self = Emulator{pc: p.Head}
return self
}
/** Implementation of ir.CallState **/
func (self *Emulator) Gr(id hir.GenericRegister) uint64 {
return self.uv[id]
}
func (self *Emulator) Pr(id hir.PointerRegister) unsafe.Pointer {
return self.pv[id]
}
func (self *Emulator) SetGr(id hir.GenericRegister, val uint64) {
self.uv[id] = val
}
func (self *Emulator) SetPr(id hir.PointerRegister, val unsafe.Pointer) {
self.pv[id] = val
}
/** State Dumping **/
const _F_emulator = `Emulator {
pc (%p)%s
r0 %#x
r1 %#x
r2 %#x
r3 %#x
r4 %#x
r5 %#x
----
p0 %p
p1 %p
p2 %p
p3 %p
p4 %p
p5 %p
p6 %p
}`
func (self *Emulator) String() string {
return fmt.Sprintf(
_F_emulator,
self.pc,
self.pc.Disassemble(nil),
self.uv[0],
self.uv[1],
self.uv[2],
self.uv[3],
self.uv[4],
self.uv[5],
self.pv[0],
self.pv[1],
self.pv[2],
self.pv[3],
self.pv[4],
self.pv[5],
self.pv[6],
)
}