/
code.go
1240 lines (1012 loc) · 24.3 KB
/
code.go
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package dextk
import (
"errors"
"fmt"
"math"
)
var ErrBadOp = errors.New("malformed op")
type OpNode interface {
RawOp() Op
String() string
}
type NopOpNode struct {
Raw Op
}
func (n NopOpNode) RawOp() Op {
return n.Raw
}
func (n NopOpNode) String() string {
return n.Raw.Code().String()
}
type MoveOpNode struct {
Raw Op
Src uint16
Dst uint16
}
func (n MoveOpNode) RawOp() Op {
return n.Raw
}
func (n MoveOpNode) String() string {
return fmt.Sprintf("%v src=%v dst=%v", n.Raw.Code(), n.Src, n.Dst)
}
type MoveResultOpNode struct {
Raw Op
Dst uint8
}
func (n MoveResultOpNode) RawOp() Op {
return n.Raw
}
func (n MoveResultOpNode) String() string {
return fmt.Sprintf("%v dst=%v", n.Raw.Code(), n.Dst)
}
type MoveExceptionOpNode struct {
Raw Op
Dst uint8
}
func (n MoveExceptionOpNode) RawOp() Op {
return n.Raw
}
func (n MoveExceptionOpNode) String() string {
return fmt.Sprintf("%v dst=%v", n.Raw.Code(), n.Dst)
}
type ReturnOpNode struct {
Raw Op
// -1 = void
Value int16
}
func (n ReturnOpNode) RawOp() Op {
return n.Raw
}
func (n ReturnOpNode) String() string {
return fmt.Sprintf("%v value=%v", n.Raw.Code(), n.Value)
}
type ConstOpNode struct {
Raw Op
Dst uint8
Value any
}
func (n ConstOpNode) RawOp() Op {
return n.Raw
}
func (n ConstOpNode) String() string {
return fmt.Sprintf("%v dst=%v value='%v'", n.Raw.Code(), n.Dst, n.Value)
}
type MonitorOpNode struct {
Raw Op
Ref uint8
Enter bool
}
func (n MonitorOpNode) RawOp() Op {
return n.Raw
}
func (n MonitorOpNode) String() string {
return fmt.Sprintf("%v ref=%v enter=%v", n.Raw.Code(), n.Ref, n.Enter)
}
type CheckCastOpNode struct {
Raw Op
Ref uint8
Type TypeDescriptor
}
func (n CheckCastOpNode) RawOp() Op {
return n.Raw
}
func (n CheckCastOpNode) String() string {
return fmt.Sprintf("%v ref=%v type=%v", n.Raw.Code(), n.Ref, n.Type)
}
type InstanceOfOpNode struct {
Raw Op
Src uint8
Dst uint8
Type TypeDescriptor
}
func (n InstanceOfOpNode) RawOp() Op {
return n.Raw
}
func (n InstanceOfOpNode) String() string {
return fmt.Sprintf("%v src=%v dst=%v type=%v", n.Raw.Code(), n.Src, n.Dst, n.Type)
}
type ArrayLenOpNode struct {
Raw Op
Ref uint8
Dst uint8
}
func (n ArrayLenOpNode) RawOp() Op {
return n.Raw
}
func (n ArrayLenOpNode) String() string {
return fmt.Sprintf("%v ref=%v dst=%v", n.Raw.Code(), n.Ref, n.Dst)
}
type NewInstanceOpNode struct {
Raw Op
Dst uint8
Type string
}
func (n NewInstanceOpNode) RawOp() Op {
return n.Raw
}
func (n NewInstanceOpNode) String() string {
return fmt.Sprintf("%v dst=%v type=%v", n.Raw.Code(), n.Dst, n.Type)
}
type NewArrayOpNode struct {
Raw Op
Dst uint8
SizeReg uint8
Type TypeDescriptor
}
func (n NewArrayOpNode) RawOp() Op {
return n.Raw
}
func (n NewArrayOpNode) String() string {
return fmt.Sprintf("%v dst=%v size=%v type=%v", n.Raw.Code(), n.Dst, n.SizeReg, n.Type)
}
type FilledNewArrayOpNode struct {
Raw Op
Type TypeDescriptor
ValueRegs []uint16
}
func (n FilledNewArrayOpNode) RawOp() Op {
return n.Raw
}
func (n FilledNewArrayOpNode) String() string {
return fmt.Sprintf("%v type=%v values=%v", n.Raw.Code(), n.Type, n.ValueRegs)
}
type FillArrayDataOpNode struct {
Raw Op
Ref uint8
FmtFillArrayDataPayload
}
func (n FillArrayDataOpNode) RawOp() Op {
return n.Raw
}
func (n FillArrayDataOpNode) String() string {
return fmt.Sprintf("%v ref=%v %v", n.Raw.Code(), n.Ref, n.FmtFillArrayDataPayload)
}
type ThrowOpNode struct {
Raw Op
Reg uint8
}
func (n ThrowOpNode) RawOp() Op {
return n.Raw
}
func (n ThrowOpNode) String() string {
return fmt.Sprintf("%v reg=%v", n.Raw.Code(), n.Reg)
}
type GotoOpNode struct {
Raw Op
Tgt int
}
func (n GotoOpNode) RawOp() Op {
return n.Raw
}
func (n GotoOpNode) String() string {
return fmt.Sprintf("%v tgt=%v", n.Raw.Code(), n.Tgt)
}
type PackedSwitchOpNode struct {
Raw Op
Reg uint8
FirstKey int32
Targets []int
}
func (n PackedSwitchOpNode) RawOp() Op {
return n.Raw
}
func (n PackedSwitchOpNode) String() string {
return fmt.Sprintf("%v first=%v tgts=%v", n.Raw.Code(), n.FirstKey, n.Targets)
}
type SparseSwitchOpNode struct {
Raw Op
Reg uint8
Keys []int32
Targets []int
}
func (n SparseSwitchOpNode) RawOp() Op {
return n.Raw
}
func (n SparseSwitchOpNode) String() string {
return fmt.Sprintf("%v keys=%v tgts=%v", n.Raw.Code(), n.Keys, n.Targets)
}
type CmpOpNode struct {
Raw Op
SrcA uint8
SrcB uint8
Dst uint8
}
func (n CmpOpNode) RawOp() Op {
return n.Raw
}
func (n CmpOpNode) String() string {
return fmt.Sprintf("%v a=%v b=%v tgt=%v", n.Raw.Code(), n.SrcA, n.SrcB, n.Dst)
}
type IfTestOpNode struct {
Raw Op
A uint8
// -1 = const 0
B int16
Tgt int
}
func (n IfTestOpNode) RawOp() Op {
return n.Raw
}
func (n IfTestOpNode) String() string {
return fmt.Sprintf("%v a=%v b=%v tgt=%v", n.Raw.Code(), n.A, n.B, n.Tgt)
}
type AGetOpNode struct {
Raw Op
Dst uint8
Array uint8
Index uint8
}
func (n AGetOpNode) RawOp() Op {
return n.Raw
}
func (n AGetOpNode) String() string {
return fmt.Sprintf("%v array=%v index=%v dst=%v", n.Raw.Code(), n.Array, n.Index, n.Dst)
}
type APutOpNode struct {
Raw Op
Src uint8
Array uint8
Index uint8
}
func (n APutOpNode) RawOp() Op {
return n.Raw
}
func (n APutOpNode) String() string {
return fmt.Sprintf("%v array=%v index=%v src=%v", n.Raw.Code(), n.Array, n.Index, n.Src)
}
type IGetOpNode struct {
Raw Op
Dst uint8
Obj uint8
Field FieldRef
}
func (n IGetOpNode) RawOp() Op {
return n.Raw
}
func (n IGetOpNode) String() string {
return fmt.Sprintf("%v obj=%v field=%v dst=%v", n.Raw.Code(), n.Obj, n.Field, n.Dst)
}
type IPutOpNode struct {
Raw Op
Src uint8
Obj uint8
Field FieldRef
}
func (n IPutOpNode) RawOp() Op {
return n.Raw
}
func (n IPutOpNode) String() string {
return fmt.Sprintf("%v obj=%v field=%v src=%v", n.Raw.Code(), n.Obj, n.Field, n.Src)
}
type SGetOpNode struct {
Raw Op
Dst uint8
Field FieldRef
}
func (n SGetOpNode) RawOp() Op {
return n.Raw
}
func (n SGetOpNode) String() string {
return fmt.Sprintf("%v field=%v dst=%v", n.Raw.Code(), n.Field, n.Dst)
}
type SPutOpNode struct {
Raw Op
Src uint8
Field FieldRef
}
func (n SPutOpNode) RawOp() Op {
return n.Raw
}
func (n SPutOpNode) String() string {
return fmt.Sprintf("%v field=%v src=%v", n.Raw.Code(), n.Field, n.Src)
}
type InvokeOpNode struct {
Raw Op
Method MethodRef
Args []uint16
}
func (n InvokeOpNode) RawOp() Op {
return n.Raw
}
func (n InvokeOpNode) String() string {
return fmt.Sprintf("%v method=%v args=%v", n.Raw.Code(), n.Method, n.Args)
}
type UnaryOpNode struct {
Raw Op
Src uint8
Dst uint8
}
func (n UnaryOpNode) RawOp() Op {
return n.Raw
}
func (n UnaryOpNode) String() string {
return fmt.Sprintf("%v src=%v dst=%v", n.Raw.Code(), n.Src, n.Dst)
}
type BinaryOpNode struct {
Raw Op
SrcA uint8
SrcB uint8
Dst uint8
}
func (n BinaryOpNode) RawOp() Op {
return n.Raw
}
func (n BinaryOpNode) String() string {
return fmt.Sprintf("%v srca=%v srcb=%v dst=%v", n.Raw.Code(), n.SrcA, n.SrcB, n.Dst)
}
type BinaryLiteralOpNode struct {
Raw Op
SrcA uint8
ValueB int16
Dst uint8
}
func (n BinaryLiteralOpNode) RawOp() Op {
return n.Raw
}
func (n BinaryLiteralOpNode) String() string {
return fmt.Sprintf("%v srca=%v valueb=%v dst=%v", n.Raw.Code(), n.SrcA, n.ValueB, n.Dst)
}
type UnknownOpNode struct {
Raw Op
}
func (n UnknownOpNode) RawOp() Op {
return n.Raw
}
func (n UnknownOpNode) String() string {
return fmt.Sprintf("%v (unknown)", n.Raw.Code())
}
type CodeNode struct {
RegisterCount uint16
IncomingCount uint16
OutgoingCount uint16
Ops []OpNode
// TODO: DebugInfoOff, Tries, Handlers
}
func (r *Reader) ReadCodeAndParse(off uint32) (CodeNode, error) {
var res CodeNode
c, err := r.ReadCode(off)
if err != nil {
return res, nil
}
res.RegisterCount = c.RegisterCount
res.IncomingCount = c.IncomingCount
res.OutgoingCount = c.OutgoingCount
or := NewOpReader(c.Insns)
// Perform an initial pass to discover instruction positions
idMap := make([]uint, len(c.Insns))
idPos := uint(0)
for or.HasMore() {
idMap[or.pos] = idPos
err := or.Skip()
if err != nil {
return res, err
}
idPos++
}
// Second pass to parse instructions
res.Ops = make([]OpNode, idPos)
idPos = 0
or.Seek(0)
for or.HasMore() {
pos := or.pos
o, err := or.Read()
if err != nil {
return res, err
}
var parsed OpNode
switch ot := o.(type) {
case OpNop, OpPseudoPackedSwitchPayload, OpPseudoSparseSwitchPayload, OpPseudoFillArrayDataPayload:
parsed = NopOpNode{
Raw: ot,
}
case OpMove, OpMoveWide, OpMoveObject:
data := (ot.Fmt()).(Fmt12x)
parsed = MoveOpNode{
Raw: ot,
Src: uint16(data.B),
Dst: uint16(data.A),
}
case OpMoveFrom16, OpMoveWideFrom16, OpMoveObjectFrom16:
data := (ot.Fmt()).(Fmt22x)
parsed = MoveOpNode{
Raw: ot,
Src: data.B,
Dst: uint16(data.A),
}
case OpMove16, OpMoveWide16, OpMoveObject16:
data := (ot.Fmt()).(Fmt32x)
parsed = MoveOpNode{
Raw: ot,
Src: data.B,
Dst: data.A,
}
case OpMoveResult, OpMoveResultWide, OpMoveResultObject:
data := (ot.Fmt()).(Fmt11x)
parsed = MoveResultOpNode{
Raw: ot,
Dst: data.A,
}
case OpMoveException:
data := (ot.Fmt()).(Fmt11x)
parsed = MoveExceptionOpNode{
Raw: ot,
Dst: data.A,
}
case OpReturnVoid:
parsed = ReturnOpNode{
Raw: ot,
Value: -1,
}
case OpReturn, OpReturnWide, OpReturnObject:
data := (ot.Fmt()).(Fmt11x)
parsed = ReturnOpNode{
Raw: ot,
Value: int16(data.A),
}
case OpConst4:
data := (ot.Fmt()).(Fmt11n)
val := uint32(data.B)
if (val & 0b1000) != 0 {
val |= math.MaxUint32 >> 4 << 4
}
conv := int32(val)
parsed = ConstOpNode{
Raw: ot,
Dst: data.A,
Value: conv,
}
case OpConst16:
data := (ot.Fmt()).(Fmt21s)
val := uint32(data.B)
if (val & (1 << 15)) != 0 {
val |= math.MaxUint32 >> 16 << 16
}
conv := int32(val)
parsed = ConstOpNode{
Raw: ot,
Dst: data.A,
Value: conv,
}
case OpConst:
data := (ot.Fmt()).(Fmt31i)
conv := int32(data.B)
parsed = ConstOpNode{
Raw: ot,
Dst: data.A,
Value: conv,
}
case OpConstHigh16:
data := (ot.Fmt()).(Fmt21h)
conv := int32(uint32(data.B) << 16)
parsed = ConstOpNode{
Raw: ot,
Dst: data.A,
Value: conv,
}
case OpConstWide16:
data := (ot.Fmt()).(Fmt21s)
val := uint64(data.B)
if (val & (1 << 15)) != 0 {
val |= math.MaxUint64 >> 16 << 16
}
conv := int64(val)
parsed = ConstOpNode{
Raw: ot,
Dst: data.A,
Value: conv,
}
case OpConstWide32:
data := (ot.Fmt()).(Fmt31i)
val := uint64(data.B)
if (val & (1 << 31)) != 0 {
val |= math.MaxUint64 >> 32 << 32
}
conv := int64(val)
parsed = ConstOpNode{
Raw: ot,
Dst: data.A,
Value: conv,
}
case OpConstWide:
data := (ot.Fmt()).(Fmt51l)
conv := int64(data.B)
parsed = ConstOpNode{
Raw: ot,
Dst: data.A,
Value: conv,
}
case OpConstWideHigh16:
data := (ot.Fmt()).(Fmt21h)
conv := int64(uint64(data.B) << 48)
parsed = ConstOpNode{
Raw: ot,
Dst: data.A,
Value: conv,
}
case OpConstString:
data := (ot.Fmt()).(Fmt21c)
val, err := r.ReadString(uint32(data.B))
if err != nil {
return res, err
}
parsed = ConstOpNode{
Raw: ot,
Dst: data.A,
Value: val,
}
case OpConstStringJumbo:
data := (ot.Fmt()).(Fmt31c)
val, err := r.ReadString(data.B)
if err != nil {
return res, err
}
parsed = ConstOpNode{
Raw: ot,
Dst: data.A,
Value: val,
}
case OpConstClass:
data := (ot.Fmt()).(Fmt21c)
val, err := r.ReadTypeAndParse(uint32(data.B))
if err != nil {
return res, err
}
parsed = ConstOpNode{
Raw: ot,
Dst: data.A,
Value: val,
}
case OpMonitorEnter:
data := (ot.Fmt()).(Fmt11x)
parsed = MonitorOpNode{
Raw: ot,
Ref: data.A,
Enter: true,
}
case OpMonitorExit:
data := (ot.Fmt()).(Fmt11x)
parsed = MonitorOpNode{
Raw: ot,
Ref: data.A,
Enter: false,
}
case OpCheckCast:
data := (ot.Fmt()).(Fmt21c)
val, err := r.ReadTypeAndParse(uint32(data.B))
if err != nil {
return res, err
}
parsed = CheckCastOpNode{
Raw: ot,
Ref: data.A,
Type: val,
}
case OpInstanceOf:
data := (ot.Fmt()).(Fmt22c)
val, err := r.ReadTypeAndParse(uint32(data.C))
if err != nil {
return res, err
}
parsed = InstanceOfOpNode{
Raw: ot,
Dst: data.A,
Src: data.B,
Type: val,
}
case OpArrayLength:
data := (ot.Fmt()).(Fmt12x)
parsed = ArrayLenOpNode{
Raw: ot,
Dst: data.A,
Ref: data.B,
}
case OpNewInstance:
data := (ot.Fmt()).(Fmt21c)
parsedDesc, err := r.ReadTypeAndParse(uint32(data.B))
if err != nil {
return res, fmt.Errorf("bad class type: %w", err)
}
if !parsedDesc.IsClass() || parsedDesc.IsArray() {
return res, fmt.Errorf("%w: invalid descriptor", ErrBadOp)
}
parsed = NewInstanceOpNode{
Raw: ot,
Dst: data.A,
Type: parsedDesc.ClassName,
}
case OpNewArray:
data := (ot.Fmt()).(Fmt22c)
parsedDesc, err := r.ReadTypeAndParse(uint32(data.C))
if err != nil {
return res, fmt.Errorf("bad class type: %w", err)
}
if !parsedDesc.IsArray() {
return res, fmt.Errorf("%w: %v: invalid descriptor", ErrBadOp, ot)
}
parsed = NewArrayOpNode{
Raw: ot,
Dst: data.A,
SizeReg: data.B,
Type: parsedDesc,
}
case OpFilledNewArray:
data := (ot.Fmt()).(Fmt35c)
parsedDesc, err := r.ReadTypeAndParse(uint32(data.B))
if err != nil {
return res, fmt.Errorf("bad class type: %w", err)
}
if !parsedDesc.IsArray() {
return res, fmt.Errorf("%w: %v: invalid descriptor", ErrBadOp, ot)
}
values := make([]uint16, data.A)
if data.A >= 1 {
values[0] = uint16(data.C)
}
if data.A >= 2 {
values[1] = uint16(data.D)
}
if data.A >= 3 {
values[2] = uint16(data.E)
}
if data.A >= 4 {
values[3] = uint16(data.F)
}
if data.A >= 5 {
values[4] = uint16(data.G)
}
parsed = FilledNewArrayOpNode{
Raw: ot,
Type: parsedDesc,
ValueRegs: values,
}
case OpFilledNewArrayRange:
data := (ot.Fmt()).(Fmt3rc)
parsedDesc, err := r.ReadTypeAndParse(uint32(data.B))
if err != nil {
return res, fmt.Errorf("bad class type: %w", err)
}
if !parsedDesc.IsArray() {
return res, fmt.Errorf("%w: %v: invalid descriptor", ErrBadOp, ot)
}
values := make([]uint16, data.A)
for i := uint8(0); i < data.A; i++ {
values[i] = data.C + uint16(i)
}
parsed = FilledNewArrayOpNode{
Raw: ot,
Type: parsedDesc,
ValueRegs: values,
}
case OpFillArrayData:
data := (ot.Fmt()).(Fmt31t)
tgt := pos + int(int32(data.B))
if tgt < 0 || tgt >= len(idMap) {
return res, fmt.Errorf("%w: invalid data offset %v", ErrBadOp, tgt)
}
oldPos := or.Pos()
or.Seek(tgt)
rtop, err := or.Read()
if err != nil {
return res, fmt.Errorf("%w: invalid data %w", ErrBadOp, err)
}
tableOp, ok := (rtop).(OpPseudoFillArrayDataPayload)
if !ok {
return res, fmt.Errorf("%w: invalid data %v", ErrBadOp, tableOp)
}
or.Seek(oldPos)
parsed = FillArrayDataOpNode{
Raw: ot,
Ref: data.A,
FmtFillArrayDataPayload: tableOp.FmtFillArrayDataPayload,
}
case OpThrow:
data := (ot.Fmt()).(Fmt11x)
parsed = ThrowOpNode{
Raw: ot,
Reg: data.A,
}
case OpGoto:
data := (ot.Fmt()).(Fmt10t)
tgt := pos + int(int8(data.A))
if tgt < 0 || tgt >= len(idMap) {
return res, fmt.Errorf("%w: invalid goto jump offset %v", ErrBadOp, tgt)
}
id := idMap[tgt]
if id == 0 && tgt != 0 {
return res, fmt.Errorf("%w: invalid goto jump offset %v", ErrBadOp, tgt)
}
parsed = GotoOpNode{
Raw: ot,
Tgt: int(id),
}
case OpGoto16:
data := (ot.Fmt()).(Fmt20t)
tgt := pos + int(int16(data.A))
if tgt < 0 || tgt >= len(idMap) {
return res, fmt.Errorf("%w: invalid goto16 jump offset %v", ErrBadOp, tgt)
}
id := idMap[tgt]
if id == 0 && tgt != 0 {
return res, fmt.Errorf("%w: invalid goto16 jump offset %v", ErrBadOp, tgt)
}
parsed = GotoOpNode{
Raw: ot,
Tgt: int(id),
}
case OpGoto32:
data := (ot.Fmt()).(Fmt30t)
tgt := pos + int(int32(data.A))
if tgt < 0 || tgt >= len(idMap) {
return res, fmt.Errorf("%w: invalid goto32 jump offset %v", ErrBadOp, tgt)
}
id := idMap[tgt]
if id == 0 && tgt != 0 {
return res, fmt.Errorf("%w: invalid goto32 jump offset %v", ErrBadOp, tgt)
}
parsed = GotoOpNode{
Raw: ot,
Tgt: int(id),
}
case OpPackedSwitch:
data := (ot.Fmt()).(Fmt31t)
tgt := pos + int(int32(data.B))
if tgt < 0 || tgt >= len(idMap) {
return res, fmt.Errorf("%w: invalid table offset %v", ErrBadOp, tgt)
}
oldPos := or.Pos()
or.Seek(tgt)
rtop, err := or.Read()
if err != nil {
return res, fmt.Errorf("%w: invalid table %w", ErrBadOp, err)
}
tableOp, ok := (rtop).(OpPseudoPackedSwitchPayload)
if !ok {
return res, fmt.Errorf("%w: invalid table %v", ErrBadOp, tableOp)
}
or.Seek(oldPos)
tgts := make([]int, len(tableOp.Targets))
for i, target := range tableOp.Targets {
tgts[i] = pos + int(target)
}
parsed = PackedSwitchOpNode{
Raw: ot,
Reg: data.A,
FirstKey: tableOp.FirstKey,
Targets: tgts,
}
case OpSparseSwitch:
data := (ot.Fmt()).(Fmt31t)
tgt := pos + int(int32(data.B))
if tgt < 0 || tgt >= len(idMap) {
return res, fmt.Errorf("%w: invalid table offset %v", ErrBadOp, tgt)
}
oldPos := or.Pos()
or.Seek(tgt)
rtop, err := or.Read()
if err != nil {
return res, fmt.Errorf("%w: invalid table %w", ErrBadOp, err)
}
tableOp, ok := (rtop).(OpPseudoSparseSwitchPayload)
if !ok {
return res, fmt.Errorf("%w: invalid table %v", ErrBadOp, tableOp)
}
or.Seek(oldPos)
tgts := make([]int, len(tableOp.Targets))
for i, target := range tableOp.Targets {
tgts[i] = pos + int(target)
}
parsed = SparseSwitchOpNode{
Raw: ot,
Reg: data.A,
Keys: tableOp.Keys,
Targets: tgts,
}
case OpCmplFloat, OpCmpgFloat, OpCmplDouble, OpCmpgDouble, OpCmpLong:
data := (ot.Fmt()).(Fmt23x)
parsed = CmpOpNode{
Raw: ot,