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https://github.com/nspcc-dev/neo-go.git
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Merge pull request #357 from nspcc-dev/complete-vm-array-instructions
Add UNPACK, REVERSE, REMOVE, plus some tests for PACK. Fixes #195.
This commit is contained in:
Roman Khimov
GitHub
commit
dd357c9119
4 changed files with 206 additions and 2 deletions
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@ -84,6 +84,18 @@ func (e *Element) Bytes() []byte {
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return e.value.Value().([]byte)
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}
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// Array attempts to get the underlying value of the element as an array of
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// other items. Will panic if the item type is different which will be caught
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// by the VM.
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func (e *Element) Array() []StackItem {
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switch t := e.value.(type) {
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case *ArrayItem:
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return t.value
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default:
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panic("element is not an array")
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}
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}
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// Stack represents a Stack backed by a double linked list.
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type Stack struct {
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top Element
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@ -37,6 +37,12 @@ func makeStackItem(v interface{}) StackItem {
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}
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case StackItem:
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return val
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case []int:
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a := []StackItem{}
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for _, i := range val {
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a = append(a, makeStackItem(i))
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}
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return makeStackItem(a)
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default:
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panic(
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fmt.Sprintf(
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25
pkg/vm/vm.go
25
pkg/vm/vm.go
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@ -607,6 +607,14 @@ func (v *VM) execute(ctx *Context, op Instruction) {
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v.estack.PushVal(items)
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case UNPACK:
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a := v.estack.Pop().Array()
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l := len(a)
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for i := l - 1; i >= 0; i-- {
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v.estack.PushVal(a[i])
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}
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v.estack.PushVal(l)
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case PICKITEM:
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var (
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key = v.estack.Pop()
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@ -647,6 +655,20 @@ func (v *VM) execute(ctx *Context, op Instruction) {
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panic(fmt.Sprintf("SETITEM: invalid item type %s", t))
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}
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case REVERSE:
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a := v.estack.Peek(0).Array()
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if len(a) > 1 {
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for i, j := 0, len(a)-1; i <= j; i, j = i+1, j-1 {
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a[i], a[j] = a[j], a[i]
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}
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}
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case REMOVE:
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key := int(v.estack.Pop().BigInt().Int64())
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elem := v.estack.Peek(0)
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a := elem.Array()
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a = append(a[:key], a[key+1:]...)
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elem.value = makeStackItem(a)
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case ARRAYSIZE:
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elem := v.estack.Pop()
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// Cause there is no native (byte) item type here, hence we need to check
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@ -729,8 +751,7 @@ func (v *VM) execute(ctx *Context, op Instruction) {
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v.state = haltState
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}
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case CHECKSIG, CHECKMULTISIG,
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UNPACK, REVERSE, REMOVE:
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case CHECKSIG, CHECKMULTISIG:
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panic("unimplemented")
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// Cryptographic operations.
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@ -633,6 +633,171 @@ func TestRIGHTBadLen(t *testing.T) {
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assert.Equal(t, true, vm.state.HasFlag(faultState))
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}
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func TestPACKBadLen(t *testing.T) {
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prog := makeProgram(PACK)
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vm := load(prog)
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vm.estack.PushVal(1)
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vm.Run()
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assert.Equal(t, true, vm.state.HasFlag(faultState))
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}
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func TestPACKGoodZeroLen(t *testing.T) {
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prog := makeProgram(PACK)
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vm := load(prog)
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vm.estack.PushVal(0)
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vm.Run()
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assert.Equal(t, false, vm.state.HasFlag(faultState))
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assert.Equal(t, 1, vm.estack.Len())
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assert.Equal(t, []StackItem{}, vm.estack.Peek(0).Array())
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}
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func TestPACKGood(t *testing.T) {
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prog := makeProgram(PACK)
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elements := []int{55, 34, 42}
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vm := load(prog)
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// canary
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vm.estack.PushVal(1)
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for i := len(elements) - 1; i >= 0; i-- {
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vm.estack.PushVal(elements[i])
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}
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vm.estack.PushVal(len(elements))
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vm.Run()
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assert.Equal(t, false, vm.state.HasFlag(faultState))
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assert.Equal(t, 2, vm.estack.Len())
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a := vm.estack.Peek(0).Array()
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assert.Equal(t, len(elements), len(a))
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for i := 0; i < len(elements); i++ {
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e := a[i].Value().(*big.Int)
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assert.Equal(t, int64(elements[i]), e.Int64())
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}
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assert.Equal(t, int64(1), vm.estack.Peek(1).BigInt().Int64())
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}
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func TestUNPACKBadNotArray(t *testing.T) {
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prog := makeProgram(UNPACK)
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vm := load(prog)
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vm.estack.PushVal(1)
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vm.Run()
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assert.Equal(t, true, vm.state.HasFlag(faultState))
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}
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func TestUNPACKGood(t *testing.T) {
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prog := makeProgram(UNPACK)
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elements := []int{55, 34, 42}
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vm := load(prog)
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// canary
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vm.estack.PushVal(1)
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vm.estack.PushVal(elements)
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vm.Run()
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assert.Equal(t, false, vm.state.HasFlag(faultState))
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assert.Equal(t, 5, vm.estack.Len())
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assert.Equal(t, int64(len(elements)), vm.estack.Peek(0).BigInt().Int64())
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for k, v := range elements {
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assert.Equal(t, int64(v), vm.estack.Peek(k + 1).BigInt().Int64())
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}
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assert.Equal(t, int64(1), vm.estack.Peek(len(elements) + 1).BigInt().Int64())
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}
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func TestREVERSEBadNotArray(t *testing.T) {
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prog := makeProgram(REVERSE)
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vm := load(prog)
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vm.estack.PushVal(1)
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vm.Run()
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assert.Equal(t, true, vm.state.HasFlag(faultState))
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}
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func TestREVERSEGoodOneElem(t *testing.T) {
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prog := makeProgram(REVERSE)
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elements := []int{22}
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vm := load(prog)
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vm.estack.PushVal(1)
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vm.estack.PushVal(elements)
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vm.Run()
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assert.Equal(t, false, vm.state.HasFlag(faultState))
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assert.Equal(t, 2, vm.estack.Len())
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a := vm.estack.Peek(0).Array()
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assert.Equal(t, len(elements), len(a))
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e := a[0].Value().(*big.Int)
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assert.Equal(t, int64(elements[0]), e.Int64())
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}
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func TestREVERSEGood(t *testing.T) {
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eodd := []int{22, 34, 42, 55, 81}
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even := []int{22, 34, 42, 55, 81, 99}
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eall := [][]int{eodd, even}
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for _, elements := range eall {
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prog := makeProgram(REVERSE)
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vm := load(prog)
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vm.estack.PushVal(1)
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vm.estack.PushVal(elements)
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vm.Run()
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assert.Equal(t, false, vm.state.HasFlag(faultState))
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assert.Equal(t, 2, vm.estack.Len())
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a := vm.estack.Peek(0).Array()
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assert.Equal(t, len(elements), len(a))
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for k, v := range elements {
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e := a[len(a) - 1 - k].Value().(*big.Int)
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assert.Equal(t, int64(v), e.Int64())
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}
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assert.Equal(t, int64(1), vm.estack.Peek(1).BigInt().Int64())
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}
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}
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func TestREMOVEBadNoArgs(t *testing.T) {
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prog := makeProgram(REMOVE)
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vm := load(prog)
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vm.Run()
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assert.Equal(t, true, vm.state.HasFlag(faultState))
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}
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func TestREMOVEBadOneArg(t *testing.T) {
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prog := makeProgram(REMOVE)
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vm := load(prog)
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vm.estack.PushVal(1)
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vm.Run()
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assert.Equal(t, true, vm.state.HasFlag(faultState))
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}
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func TestREMOVEBadNotArray(t *testing.T) {
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prog := makeProgram(REMOVE)
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vm := load(prog)
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vm.estack.PushVal(1)
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vm.estack.PushVal(1)
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vm.Run()
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assert.Equal(t, true, vm.state.HasFlag(faultState))
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}
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func TestREMOVEBadIndex(t *testing.T) {
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prog := makeProgram(REMOVE)
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elements := []int{22, 34, 42, 55, 81}
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vm := load(prog)
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vm.estack.PushVal(elements)
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vm.estack.PushVal(10)
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vm.Run()
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assert.Equal(t, true, vm.state.HasFlag(faultState))
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}
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func TestREMOVEGood(t *testing.T) {
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prog := makeProgram(REMOVE)
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elements := []int{22, 34, 42, 55, 81}
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reselements := []int{22, 34, 55, 81}
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vm := load(prog)
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vm.estack.PushVal(1)
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vm.estack.PushVal(elements)
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vm.estack.PushVal(2)
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vm.Run()
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assert.Equal(t, false, vm.state.HasFlag(faultState))
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assert.Equal(t, 2, vm.estack.Len())
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a := vm.estack.Peek(0).Array()
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assert.Equal(t, len(reselements), len(a))
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for k, v := range reselements {
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e := a[k].Value().(*big.Int)
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assert.Equal(t, int64(v), e.Int64())
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}
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assert.Equal(t, int64(1), vm.estack.Peek(1).BigInt().Int64())
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}
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func makeProgram(opcodes ...Instruction) []byte {
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prog := make([]byte, len(opcodes)+1) // RET
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for i := 0; i < len(opcodes); i++ {
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