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opblock.go
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/*
* Copyright (c) 2022 The GoPlus Authors (goplus.org). All rights reserved.
*
* 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 igop
import (
"fmt"
"go/token"
"go/types"
"io"
"reflect"
"strings"
"sync"
"sync/atomic"
"unsafe"
"github.com/goplus/igop/load"
"github.com/goplus/reflectx"
"github.com/visualfc/funcval"
"github.com/visualfc/xtype"
"golang.org/x/tools/go/ssa"
)
/*
type Op int
const (
OpInvalid Op = iota
// Value-defining instructions
OpAlloc
OpPhi
OpCall
OpBinOp
OpUnOp
OpChangeType
OpConvert
OpChangeInterface
OpSliceToArrayPointer
OpMakeInterface
OpMakeClosure
OpMakeMap
OpMakeChan
OpMakeSlice
OpSlice
OpFieldAddr
OpField
OpIndexAddr
OpIndex
OpLookup
OpSelect
OpRange
OpNext
OpTypeAssert
OpExtract
// Instructions executed for effect
OpJump
OpIf
OpReturn
OpRunDefers
OpPanic
OpGo
OpDefer
OpSend
OpStore
OpMapUpdate
OpDebugRef
)
*/
type kind int
func (k kind) isStatic() bool {
return k == kindConst || k == kindGlobal || k == kindFunction
}
const (
kindInvalid kind = iota
kindConst
kindGlobal
kindFunction
)
type Value = value
type Tuple = tuple
type register int
type value = interface{}
type tuple []value
type closure struct {
pfn *function
env []value
}
type function struct {
Interp *Interp
Fn *ssa.Function // ssa function
Main *ssa.BasicBlock // Fn.Blocks[0]
pool *sync.Pool // create frame pool
makeInstr ssa.Instruction // make instr check
index map[ssa.Value]uint32 // stack value index 32bit: kind(2) reflect.Kind(6) index(24)
instrIndex map[ssa.Instruction][]uint32 // instr -> index
Instrs []func(fr *frame) // main instrs
Recover []func(fr *frame) // recover instrs
Blocks []int // block offset
stack []value // results args envs datas
ssaInstrs []ssa.Instruction // org ssa instr
base int // base of interp
nres int // results count
narg int // arguments count
nenv int // closure free vars count
used int32 // function used count
cached int32 // enable cached by pool
}
func (p *function) UnsafeRelease() {
p.Interp = nil
p.Fn = nil
p.pool = nil
p.index = nil
p.instrIndex = nil
p.Instrs = nil
p.Recover = nil
p.Blocks = nil
p.stack = nil
p.ssaInstrs = nil
p.Main = nil
}
func (p *function) initPool() {
p.pool = &sync.Pool{}
p.pool.New = func() interface{} {
fr := &frame{interp: p.Interp, pfn: p, block: p.Main}
fr.stack = append([]value{}, p.stack...)
return fr
}
}
func (p *function) allocFrame(caller *frame) *frame {
var fr *frame
if atomic.LoadInt32(&p.cached) == 1 {
fr = p.pool.Get().(*frame)
fr.block = p.Main
fr._defer = nil
fr._panic = nil
fr.ipc = 0
fr.pred = 0
} else {
if atomic.AddInt32(&p.used, 1) > int32(p.Interp.ctx.callForPool) {
atomic.StoreInt32(&p.cached, 1)
}
fr = &frame{interp: p.Interp, pfn: p, block: p.Main}
fr.stack = append([]value{}, p.stack...)
}
fr.caller = caller
fr.deferid = caller.deferid
caller.callee = fr
return fr
}
func (p *function) deleteFrame(caller *frame, fr *frame) {
if atomic.LoadInt32(&p.cached) == 1 {
p.pool.Put(fr)
} else {
caller.callee = nil
}
fr = nil
}
func (p *function) InstrForPC(pc int) ssa.Instruction {
if pc >= 0 && pc < len(p.ssaInstrs) {
return p.ssaInstrs[pc]
}
return nil
}
func (p *function) PosForPC(pc int) token.Pos {
if instr := p.InstrForPC(pc); instr != nil {
if _, ok := instr.(*ssa.RunDefers); ok {
return p.Fn.Syntax().End()
}
return instr.Pos()
}
return token.NoPos
}
func (p *function) PositionForPC(pc int) token.Position {
pos := p.PosForPC(pc)
return p.Fn.Prog.Fset.Position(pos)
}
func (p *function) regIndex3(v ssa.Value) (register, kind, value) {
instr := p.regInstr(v)
index := int(instr & 0xffffff)
return register(index), kind(instr >> 30), p.stack[index]
}
func (p *function) regIndex(v ssa.Value) register {
instr := p.regInstr(v)
return register(instr & 0xffffff)
}
func (p *function) regInstr(v ssa.Value) uint32 {
if i, ok := p.index[v]; ok {
return i
}
var vs interface{}
var vk kind
switch v := v.(type) {
case *ssa.Const:
vs = constToValue(p.Interp, v)
vk = kindConst
case *ssa.Global:
vs, _ = globalToValue(p.Interp, v)
vk = kindGlobal
case *ssa.Function:
vk = kindFunction
if v.Blocks != nil {
typ := p.Interp.preToType(v.Type())
pfn := p.Interp.loadFunction(v)
vs = pfn.makeFunction(typ, nil).Interface()
} else {
ext, ok := findExternFunc(p.Interp, v)
if !ok {
if v.Name() != "init" {
panic(fmt.Errorf("no code for function: %v", v))
}
} else {
vs = ext.Interface()
}
}
}
var kind reflect.Kind
if v != nil {
kind = toKind(v.Type())
}
i := uint32(len(p.stack) | int(vk<<30) | int(kind<<24))
p.stack = append(p.stack, vs)
p.index[v] = i
p.instrIndex[p.makeInstr] = append(p.instrIndex[p.makeInstr], i)
return i
}
func findExternValue(interp *Interp, name string) (ext reflect.Value, ok bool) {
// check override value
ext, ok = interp.ctx.override[name]
if !ok {
// check extern value
ext, ok = externValues[name]
}
return
}
func findExternLinkFunc(interp *Interp, link *load.Linkname) (ext reflect.Value, ok bool) {
fullName := link.PkgPath + "." + link.Name
// check override value
ext, ok = interp.ctx.override[fullName]
if ok {
return
}
// check extern value
ext, ok = externValues[fullName]
if ok {
return
}
// check install pkg
if pkg, found := interp.installed(link.PkgPath); found {
if recv := link.Recv; recv != "" {
var star bool
if recv[0] == '*' {
star = true
recv = recv[1:]
}
if typ, ok := pkg.NamedTypes[recv]; ok {
if star {
typ = reflect.PtrTo(typ)
}
if m, ok := reflectx.MethodByName(typ, link.Method); ok {
return m.Func, true
}
}
return
}
ext, ok = pkg.Funcs[link.Name]
}
return
}
func findExternVar(interp *Interp, pkgPath string, name string) (ext reflect.Value, ok bool) {
fullName := pkgPath + "." + name
// check override value
ext, ok = interp.ctx.override[fullName]
if ok {
return
}
// check extern value
ext, ok = externValues[fullName]
if ok {
return
}
// check install pkg
if pkg, found := interp.installed(pkgPath); found {
ext, ok = pkg.Vars[name]
}
return
}
func checkFuncCompatible(t1, t2 reflect.Type) bool {
i1 := t1.NumIn()
i2 := t2.NumIn()
if i1 != i2 {
return false
}
for i := 0; i < i1; i++ {
if t1.In(i).Size() != t2.In(i).Size() {
return false
}
}
return true
}
func findExternFunc(interp *Interp, fn *ssa.Function) (ext reflect.Value, ok bool) {
fnName := fn.String()
ext, ok = findExternValue(interp, fnName)
if ok {
typ := interp.preToType(fn.Type())
ftyp := ext.Type()
if typ != ftyp && checkFuncCompatible(typ, ftyp) {
ext = xtype.ConvertFunc(ext, xtype.TypeOfType(typ))
}
return
}
if fn.Pkg != nil {
if recv := fn.Signature.Recv(); recv == nil {
if pkg, found := interp.installed(fn.Pkg.Pkg.Path()); found {
ext, ok = pkg.Funcs[fn.Name()]
}
} else if typ, found := interp.ctx.Loader.LookupReflect(recv.Type()); found {
if m, found := reflectx.MethodByName(typ, fn.Name()); found {
ext, ok = m.Func, true
}
}
}
return
}
func makeInstr(interp *Interp, pfn *function, instr ssa.Instruction) func(fr *frame) {
switch instr := instr.(type) {
case *ssa.Alloc:
if instr.Heap {
typ := interp.preToType(instr.Type())
ir := pfn.regIndex(instr)
t := xtype.TypeOfType(typ.Elem())
pt := xtype.TypeOfType(typ)
return func(fr *frame) {
fr.setReg(ir, xtype.New(t, pt))
}
}
typ := interp.preToType(instr.Type())
ir := pfn.regIndex(instr)
t := xtype.TypeOfType(typ.Elem())
pt := xtype.TypeOfType(typ)
// ptr := xtype.NewPointer(t)
elem := reflect.New(typ.Elem()).Elem()
return func(fr *frame) {
if v := fr.reg(ir); v != nil {
reflect.ValueOf(v).Elem().Set(elem)
} else {
fr.setReg(ir, xtype.New(t, pt))
}
}
case *ssa.Phi:
ir := pfn.regIndex(instr)
ie := make([]register, len(instr.Edges))
for i, v := range instr.Edges {
ie[i] = pfn.regIndex(v)
}
return func(fr *frame) {
for i, pred := range instr.Block().Preds {
if fr.pred == pred.Index {
fr.setReg(ir, fr.reg(ie[i]))
break
}
}
}
case *ssa.Call:
return makeCallInstr(pfn, interp, instr, &instr.Call)
case *ssa.BinOp:
switch instr.Op {
case token.ADD:
return makeBinOpADD(pfn, instr)
case token.SUB:
return makeBinOpSUB(pfn, instr)
case token.MUL:
return makeBinOpMUL(pfn, instr)
case token.QUO:
return makeBinOpQUO(pfn, instr)
case token.REM:
return makeBinOpREM(pfn, instr)
case token.AND:
return makeBinOpAND(pfn, instr)
case token.OR:
return makeBinOpOR(pfn, instr)
case token.XOR:
return makeBinOpXOR(pfn, instr)
case token.AND_NOT:
return makeBinOpANDNOT(pfn, instr)
case token.LSS:
return makeBinOpLSS(pfn, instr)
case token.LEQ:
return makeBinOpLEQ(pfn, instr)
case token.GTR:
return makeBinOpGTR(pfn, instr)
case token.GEQ:
return makeBinOpGEQ(pfn, instr)
case token.EQL:
return makeBinOpEQL(pfn, instr)
case token.NEQ:
return makeBinOpNEQ(pfn, instr)
case token.SHL:
return makeBinOpSHL(pfn, instr)
case token.SHR:
return makeBinOpSHR(pfn, instr)
default:
panic("unreachable")
}
case *ssa.UnOp:
switch instr.Op {
case token.NOT:
return makeUnOpNOT(pfn, instr)
case token.SUB:
return makeUnOpSUB(pfn, instr)
case token.XOR:
return makeUnOpXOR(pfn, instr)
case token.ARROW:
return makeUnOpARROW(pfn, instr)
case token.MUL:
return makeUnOpMUL(pfn, instr)
default:
panic("unreachable")
}
case *ssa.ChangeInterface:
ir := pfn.regIndex(instr)
ix := pfn.regIndex(instr.X)
return func(fr *frame) {
fr.setReg(ir, fr.reg(ix))
}
case *ssa.ChangeType:
return makeTypeChangeInstr(pfn, instr)
case *ssa.Convert:
return makeConvertInstr(pfn, interp, instr)
case *ssa.MakeInterface:
typ := interp.preToType(instr.Type())
ir := pfn.regIndex(instr)
ix, kx, vx := pfn.regIndex3(instr.X)
if kx.isStatic() {
if typ == tyEmptyInterface {
return func(fr *frame) {
fr.setReg(ir, vx)
}
}
v := reflect.New(typ).Elem()
if vx != nil {
SetValue(v, reflect.ValueOf(vx))
}
vx = v.Interface()
return func(fr *frame) {
fr.setReg(ir, vx)
}
}
if typ == tyEmptyInterface {
return func(fr *frame) {
fr.setReg(ir, fr.reg(ix))
}
}
return func(fr *frame) {
v := reflect.New(typ).Elem()
if x := fr.reg(ix); x != nil {
vx := reflect.ValueOf(x)
SetValue(v, vx)
}
fr.setReg(ir, v.Interface())
}
case *ssa.MakeClosure:
fn := instr.Fn.(*ssa.Function)
typ := interp.preToType(fn.Type())
ir := pfn.regIndex(instr)
ib := make([]register, len(instr.Bindings))
for i, v := range instr.Bindings {
ib[i] = pfn.regIndex(v)
}
pfn := interp.loadFunction(fn)
return func(fr *frame) {
var bindings []value
for i := range instr.Bindings {
bindings = append(bindings, fr.reg(ib[i]))
}
v := pfn.makeFunction(typ, bindings)
fr.setReg(ir, v.Interface())
}
case *ssa.MakeChan:
typ := interp.preToType(instr.Type())
ir := pfn.regIndex(instr)
is := pfn.regIndex(instr.Size)
if typ.ChanDir() == reflect.BothDir {
return func(fr *frame) {
size := fr.reg(is)
buffer := asInt(size)
if buffer < 0 {
panic(fr.runtimeError(instr, "makechan: size out of range"))
}
fr.setReg(ir, reflect.MakeChan(typ, buffer).Interface())
}
}
ctyp := reflect.ChanOf(reflect.BothDir, typ.Elem())
return func(fr *frame) {
size := fr.reg(is)
buffer := asInt(size)
if buffer < 0 {
panic(fr.runtimeError(instr, "makechan: size out of range"))
}
fr.setReg(ir, reflect.MakeChan(ctyp, buffer).Convert(typ).Interface())
}
case *ssa.MakeMap:
typ := instr.Type()
rtyp := interp.preToType(typ)
ir := pfn.regIndex(instr)
if instr.Reserve == nil {
return func(fr *frame) {
fr.setReg(ir, reflect.MakeMap(rtyp).Interface())
}
}
iv := pfn.regIndex(instr.Reserve)
return func(fr *frame) {
reserve := asInt(fr.reg(iv))
fr.setReg(ir, reflect.MakeMapWithSize(rtyp, reserve).Interface())
}
case *ssa.MakeSlice:
typ := interp.preToType(instr.Type())
ir := pfn.regIndex(instr)
il := pfn.regIndex(instr.Len)
ic := pfn.regIndex(instr.Cap)
return func(fr *frame) {
Len := asInt(fr.reg(il))
if Len < 0 || Len >= maxMemLen {
panic(fr.runtimeError(instr, "makeslice: len out of range"))
}
Cap := asInt(fr.reg(ic))
if Cap < 0 || Cap >= maxMemLen {
panic(fr.runtimeError(instr, "makeslice: cap out of range"))
}
fr.setReg(ir, reflect.MakeSlice(typ, Len, Cap).Interface())
}
case *ssa.Slice:
typ := interp.preToType(instr.Type())
isNamed := typ.Kind() == reflect.Slice && typ != reflect.SliceOf(typ.Elem())
_, makesliceCheck := instr.X.(*ssa.Alloc)
ir := pfn.regIndex(instr)
ix := pfn.regIndex(instr.X)
ih := pfn.regIndex(instr.High)
il := pfn.regIndex(instr.Low)
im := pfn.regIndex(instr.Max)
if isNamed {
return func(fr *frame) {
fr.setReg(ir, slice(fr, instr, makesliceCheck, ix, ih, il, im).Convert(typ).Interface())
}
}
return func(fr *frame) {
fr.setReg(ir, slice(fr, instr, makesliceCheck, ix, ih, il, im).Interface())
}
case *ssa.FieldAddr:
ir := pfn.regIndex(instr)
ix := pfn.regIndex(instr.X)
return func(fr *frame) {
v, err := fieldAddrX(fr.reg(ix), instr.Field)
if err != nil {
panic(fr.runtimeError(instr, err.Error()))
}
fr.setReg(ir, v)
}
case *ssa.Field:
ir := pfn.regIndex(instr)
ix := pfn.regIndex(instr.X)
return func(fr *frame) {
v, err := fieldX(fr.reg(ix), instr.Field)
if err != nil {
panic(fr.runtimeError(instr, err.Error()))
}
fr.setReg(ir, v)
}
case *ssa.IndexAddr:
ir := pfn.regIndex(instr)
ix := pfn.regIndex(instr.X)
ii := pfn.regIndex(instr.Index)
return func(fr *frame) {
x := fr.reg(ix)
idx := fr.reg(ii)
v := reflect.ValueOf(x)
if v.Kind() == reflect.Ptr {
v = v.Elem()
}
switch v.Kind() {
case reflect.Slice:
case reflect.Array:
case reflect.Invalid:
panic(fr.runtimeError(instr, "invalid memory address or nil pointer dereference"))
default:
panic(fmt.Sprintf("unexpected x type in IndexAddr: %T", x))
}
index := asInt(idx)
if index < 0 {
panic(fr.runtimeError(instr, fmt.Sprintf("index out of range [%v]", index)))
} else if length := v.Len(); index >= length {
panic(fr.runtimeError(instr, fmt.Sprintf("index out of range [%v] with length %v", index, length)))
}
fr.setReg(ir, v.Index(index).Addr().Interface())
}
case *ssa.Index:
ir := pfn.regIndex(instr)
ix := pfn.regIndex(instr.X)
ii := pfn.regIndex(instr.Index)
return func(fr *frame) {
x := fr.reg(ix)
idx := fr.reg(ii)
index := asInt(idx)
v := reflect.ValueOf(x)
if index < 0 {
panic(fr.runtimeError(instr, fmt.Sprintf("index out of range [%v]", index)))
} else if length := v.Len(); index >= length {
panic(fr.runtimeError(instr, fmt.Sprintf("index out of range [%v] with length %v", index, length)))
}
fr.setReg(ir, v.Index(index).Interface())
}
case *ssa.Lookup:
typ := interp.preToType(instr.X.Type())
ir := pfn.regIndex(instr)
ix := pfn.regIndex(instr.X)
ii := pfn.regIndex(instr.Index)
switch typ.Kind() {
case reflect.String:
return func(fr *frame) {
v := fr.reg(ix)
idx := fr.reg(ii)
fr.setReg(ir, reflect.ValueOf(v).String()[asInt(idx)])
}
case reflect.Map:
return func(fr *frame) {
m := fr.reg(ix)
idx := fr.reg(ii)
vm := reflect.ValueOf(m)
v := vm.MapIndex(reflect.ValueOf(idx))
ok := v.IsValid()
var rv value
if ok {
rv = v.Interface()
} else {
rv = reflect.New(typ.Elem()).Elem().Interface()
}
if instr.CommaOk {
fr.setReg(ir, tuple{rv, ok})
} else {
fr.setReg(ir, rv)
}
}
default:
panic("unreachable")
}
case *ssa.Select:
ir := pfn.regIndex(instr)
ic := make([]register, len(instr.States))
is := make([]register, len(instr.States))
for i, state := range instr.States {
ic[i] = pfn.regIndex(state.Chan)
if state.Send != nil {
is[i] = pfn.regIndex(state.Send)
}
}
return func(fr *frame) {
var cases []reflect.SelectCase
if !instr.Blocking {
cases = append(cases, reflect.SelectCase{
Dir: reflect.SelectDefault,
})
}
for i, state := range instr.States {
var dir reflect.SelectDir
if state.Dir == types.RecvOnly {
dir = reflect.SelectRecv
} else {
dir = reflect.SelectSend
}
ch := reflect.ValueOf(fr.reg(ic[i]))
var send reflect.Value
if state.Send != nil {
v := fr.reg(is[i])
if v == nil {
send = reflect.New(ch.Type().Elem()).Elem()
} else {
send = reflect.ValueOf(v)
}
}
cases = append(cases, reflect.SelectCase{
Dir: dir,
Chan: ch,
Send: send,
})
}
chosen, recv, recvOk := reflect.Select(cases)
if !instr.Blocking {
chosen-- // default case should have index -1.
}
r := tuple{chosen, recvOk}
for n, st := range instr.States {
if st.Dir == types.RecvOnly {
var v value
if n == chosen && recvOk {
// No need to copy since send makes an unaliased copy.
v = recv.Interface()
} else {
typ := interp.toType(st.Chan.Type())
v = reflect.New(typ.Elem()).Elem().Interface()
}
r = append(r, v)
}
}
fr.setReg(ir, r)
}
case *ssa.SliceToArrayPointer:
typ := interp.preToType(instr.Type())
ir := pfn.regIndex(instr)
ix := pfn.regIndex(instr.X)
return func(fr *frame) {
x := fr.reg(ix)
v := reflect.ValueOf(x)
vLen := v.Len()
tLen := typ.Elem().Len()
if tLen > vLen {
panic(fr.runtimeError(instr, fmt.Sprintf(errSliceToArrayPointer, vLen, tLen)))
}
fr.setReg(ir, v.Convert(typ).Interface())
}
case *ssa.Range:
typ := interp.preToType(instr.X.Type())
ir := pfn.regIndex(instr)
ix := pfn.regIndex(instr.X)
switch typ.Kind() {
case reflect.String:
return func(fr *frame) {
v := fr.string(ix)
fr.setReg(ir, &stringIter{Reader: strings.NewReader(v)})
}
case reflect.Map:
return func(fr *frame) {
v := fr.reg(ix)
fr.setReg(ir, &mapIter{iter: reflect.ValueOf(v).MapRange()})
}
default:
panic("unreachable")
}
case *ssa.Next:
ir := pfn.regIndex(instr)
ii := pfn.regIndex(instr.Iter)
if instr.IsString {
return func(fr *frame) {
fr.setReg(ir, fr.reg(ii).(*stringIter).next())
}
}
return func(fr *frame) {
fr.setReg(ir, fr.reg(ii).(*mapIter).next())
}
case *ssa.TypeAssert:
typ := interp.preToType(instr.AssertedType)
xtyp := interp.preToType(instr.X.Type())
ir := pfn.regIndex(instr)
ix, kx, vx := pfn.regIndex3(instr.X)
if kx.isStatic() {
return func(fr *frame) {
fr.setReg(ir, typeAssert(fr, instr, typ, xtyp, vx))
}
}
return func(fr *frame) {
v := fr.reg(ix)
fr.setReg(ir, typeAssert(fr, instr, typ, xtyp, v))
}
case *ssa.Extract:
if *instr.Referrers() == nil {
return nil
}
ir := pfn.regIndex(instr)
it := pfn.regIndex(instr.Tuple)
return func(fr *frame) {
fr.setReg(ir, fr.reg(it).(tuple)[instr.Index])
}
// Instructions executed for effect
case *ssa.Jump:
return func(fr *frame) {
fr.pred, fr.block = fr.block.Index, fr.block.Succs[0]
fr.ipc = fr.pfn.Blocks[fr.block.Index]
}
case *ssa.If:
ic, kc, vc := pfn.regIndex3(instr.Cond)
if kc == kindConst {
if xtype.Bool(vc) {
return func(fr *frame) {
fr.pred = fr.block.Index
fr.block = fr.block.Succs[0]
fr.ipc = fr.pfn.Blocks[fr.block.Index]
}
}
return func(fr *frame) {
fr.pred = fr.block.Index
fr.block = fr.block.Succs[1]
fr.ipc = fr.pfn.Blocks[fr.block.Index]
}
}
switch instr.Cond.Type().(type) {
case *types.Basic:
return func(fr *frame) {
fr.pred = fr.block.Index
if fr.reg(ic).(bool) {
fr.block = fr.block.Succs[0]
} else {
fr.block = fr.block.Succs[1]
}
fr.ipc = fr.pfn.Blocks[fr.block.Index]
}
default:
return func(fr *frame) {
fr.pred = fr.block.Index
if fr.bool(ic) {
fr.block = fr.block.Succs[0]
} else {
fr.block = fr.block.Succs[1]
}
fr.ipc = fr.pfn.Blocks[fr.block.Index]
}
}
case *ssa.Return:
switch n := pfn.nres; n {
case 0:
return func(fr *frame) {
fr.ipc = -1
}
case 1:
ir, ik, iv := pfn.regIndex3(instr.Results[0])
if ik.isStatic() {
return func(fr *frame) {
fr.stack[0] = iv
fr.ipc = -1
}
}
return func(fr *frame) {
fr.stack[0] = fr.reg(ir)
fr.ipc = -1
}
case 2:
r1, k1, v1 := pfn.regIndex3(instr.Results[0])
r2, k2, v2 := pfn.regIndex3(instr.Results[1])
if k1.isStatic() && k2.isStatic() {
return func(fr *frame) {
fr.stack[0] = v1
fr.stack[1] = v2
fr.ipc = -1
}
} else if k1.isStatic() {
return func(fr *frame) {
fr.stack[0] = v1
fr.stack[1] = fr.reg(r2)
fr.ipc = -1
}
} else if k2.isStatic() {
return func(fr *frame) {
fr.stack[0] = fr.reg(r1)
fr.stack[1] = v2
fr.ipc = -1
}
}
return func(fr *frame) {
fr.stack[0] = fr.reg(r1)
fr.stack[1] = fr.reg(r2)
fr.ipc = -1
}
default:
ir := make([]register, n)
for i, v := range instr.Results {
ir[i] = pfn.regIndex(v)
}
return func(fr *frame) {
for i := 0; i < n; i++ {
fr.stack[i] = fr.reg(ir[i])
}
fr.ipc = -1
}
}
case *ssa.RunDefers:
return func(fr *frame) {
fr.runDefers()
}
case *ssa.Panic:
ix := pfn.regIndex(instr.X)
if interp.ctx.panicFunc != nil {
return func(fr *frame) {
var err error = PanicError{stack: debugStack(fr), Value: fr.reg(ix)}
panic(interp.ctx.handlePanic(fr, instr, err))
}
}
return func(fr *frame) {
panic(PanicError{stack: debugStack(fr), Value: fr.reg(ix)})
}
case *ssa.Go:
iv, ia, ib := getCallIndex(pfn, &instr.Call)
return func(fr *frame) {
fn, args := interp.prepareCall(fr, &instr.Call, iv, ia, ib)
atomic.AddInt32(&interp.goroutines, 1)
if interp.ctx.RunContext != nil {
go func() {
root := &frame{interp: interp}
switch f := fn.(type) {
case *ssa.Function:
root.pfn = interp.funcs[f]
case *closure:
root.pfn = f.pfn
}
defer func() {
e := recover()
if e != nil {
interp.cherror <- PanicError{stack: debugStack(root), Value: e}
}
}()
interp.callDiscardsResult(root, fn, args, instr.Call.Args)
atomic.AddInt32(&interp.goroutines, -1)
}()
} else {
go func() {
interp.callDiscardsResult(&frame{}, fn, args, instr.Call.Args)
atomic.AddInt32(&interp.goroutines, -1)
}()
}
}
case *ssa.Defer:
return makeDefer(interp, pfn, instr)
case *ssa.Send:
ic := pfn.regIndex(instr.Chan)
ix := pfn.regIndex(instr.X)
return func(fr *frame) {
c := fr.reg(ic)
x := fr.reg(ix)
ch := reflect.ValueOf(c)
if x == nil {
ch.Send(reflect.New(ch.Type().Elem()).Elem())
} else {
ch.Send(reflect.ValueOf(x))
}
}
case *ssa.Store:
// skip struct field _
if addr, ok := instr.Addr.(*ssa.FieldAddr); ok {
if s, ok := addr.X.Type().(*types.Pointer).Elem().(*types.Struct); ok {
if s.Field(addr.Field).Name() == "_" {
return nil
}
}
}
if pfn.Fn.Name() == "init" && pfn.Fn.Synthetic == "package initializer" {
pfn.Interp.chkinit[instr.Addr.String()] = true
}
ia := pfn.regIndex(instr.Addr)
iv, kv, vv := pfn.regIndex3(instr.Val)
if kv.isStatic() {
if vv == nil {
return func(fr *frame) {
x := reflect.ValueOf(fr.reg(ia))
SetValue(x.Elem(), reflect.New(x.Elem().Type()).Elem())
}
}
return func(fr *frame) {
x := reflect.ValueOf(fr.reg(ia))
SetValue(x.Elem(), reflect.ValueOf(vv))
}
}
return func(fr *frame) {
x := reflect.ValueOf(fr.reg(ia))
val := fr.reg(iv)
v := reflect.ValueOf(val)
if v.IsValid() {
SetValue(x.Elem(), v)
} else {