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vm: implement UNPACK, REVERSE, REMOVE opcodes

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Also expand makeStackItem() to accept slices of int for testing
convenience. Fixes #195.
This commit is contained in:
Roman Khimov 2019-09-06 11:32:20 +03:00
parent 5bd50c7bcd
commit aefe572df3
3 changed files with 154 additions and 2 deletions
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6
pkg/vm/stack_item.go
View file

@ -37,6 +37,12 @@ func makeStackItem(v interface{}) StackItem {
}
case StackItem:
return val
case []int:
a := []StackItem{}
for _, i := range val {
a = append(a, makeStackItem(i))
}
return makeStackItem(a)
default:
panic(
fmt.Sprintf(

25
pkg/vm/vm.go
View file

@ -607,6 +607,14 @@ func (v *VM) execute(ctx *Context, op Instruction) {
v.estack.PushVal(items)
case UNPACK:
a := v.estack.Pop().Array()
l := len(a)
for i := l - 1; i >= 0; i-- {
v.estack.PushVal(a[i])
}
v.estack.PushVal(l)
case PICKITEM:
var (
key = v.estack.Pop()
@ -647,6 +655,20 @@ func (v *VM) execute(ctx *Context, op Instruction) {
panic(fmt.Sprintf("SETITEM: invalid item type %s", t))
}
case REVERSE:
a := v.estack.Peek(0).Array()
if len(a) > 1 {
for i, j := 0, len(a)-1; i <= j; i, j = i+1, j-1 {
a[i], a[j] = a[j], a[i]
}
}
case REMOVE:
key := int(v.estack.Pop().BigInt().Int64())
elem := v.estack.Peek(0)
a := elem.Array()
a = append(a[:key], a[key+1:]...)
elem.value = makeStackItem(a)
case ARRAYSIZE:
elem := v.estack.Pop()
// Cause there is no native (byte) item type here, hence we need to check
@ -729,8 +751,7 @@ func (v *VM) execute(ctx *Context, op Instruction) {
v.state = haltState
}
case CHECKSIG, CHECKMULTISIG,
UNPACK, REVERSE, REMOVE:
case CHECKSIG, CHECKMULTISIG:
panic("unimplemented")
// Cryptographic operations.

125
pkg/vm/vm_test.go
View file

@ -673,6 +673,131 @@ func TestPACKGood(t *testing.T) {
assert.Equal(t, int64(1), vm.estack.Peek(1).BigInt().Int64())
}
func TestUNPACKBadNotArray(t *testing.T) {
prog := makeProgram(UNPACK)
vm := load(prog)
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestUNPACKGood(t *testing.T) {
prog := makeProgram(UNPACK)
elements := []int{55, 34, 42}
vm := load(prog)
// canary
vm.estack.PushVal(1)
vm.estack.PushVal(elements)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 5, vm.estack.Len())
assert.Equal(t, int64(len(elements)), vm.estack.Peek(0).BigInt().Int64())
for k, v := range elements {
assert.Equal(t, int64(v), vm.estack.Peek(k + 1).BigInt().Int64())
}
assert.Equal(t, int64(1), vm.estack.Peek(len(elements) + 1).BigInt().Int64())
}
func TestREVERSEBadNotArray(t *testing.T) {
prog := makeProgram(REVERSE)
vm := load(prog)
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestREVERSEGoodOneElem(t *testing.T) {
prog := makeProgram(REVERSE)
elements := []int{22}
vm := load(prog)
vm.estack.PushVal(1)
vm.estack.PushVal(elements)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 2, vm.estack.Len())
a := vm.estack.Peek(0).Array()
assert.Equal(t, len(elements), len(a))
e := a[0].Value().(*big.Int)
assert.Equal(t, int64(elements[0]), e.Int64())
}
func TestREVERSEGood(t *testing.T) {
eodd := []int{22, 34, 42, 55, 81}
even := []int{22, 34, 42, 55, 81, 99}
eall := [][]int{eodd, even}
for _, elements := range eall {
prog := makeProgram(REVERSE)
vm := load(prog)
vm.estack.PushVal(1)
vm.estack.PushVal(elements)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 2, vm.estack.Len())
a := vm.estack.Peek(0).Array()
assert.Equal(t, len(elements), len(a))
for k, v := range elements {
e := a[len(a) - 1 - k].Value().(*big.Int)
assert.Equal(t, int64(v), e.Int64())
}
assert.Equal(t, int64(1), vm.estack.Peek(1).BigInt().Int64())
}
}
func TestREMOVEBadNoArgs(t *testing.T) {
prog := makeProgram(REMOVE)
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestREMOVEBadOneArg(t *testing.T) {
prog := makeProgram(REMOVE)
vm := load(prog)
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestREMOVEBadNotArray(t *testing.T) {
prog := makeProgram(REMOVE)
vm := load(prog)
vm.estack.PushVal(1)
vm.estack.PushVal(1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestREMOVEBadIndex(t *testing.T) {
prog := makeProgram(REMOVE)
elements := []int{22, 34, 42, 55, 81}
vm := load(prog)
vm.estack.PushVal(elements)
vm.estack.PushVal(10)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestREMOVEGood(t *testing.T) {
prog := makeProgram(REMOVE)
elements := []int{22, 34, 42, 55, 81}
reselements := []int{22, 34, 55, 81}
vm := load(prog)
vm.estack.PushVal(1)
vm.estack.PushVal(elements)
vm.estack.PushVal(2)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 2, vm.estack.Len())
a := vm.estack.Peek(0).Array()
assert.Equal(t, len(reselements), len(a))
for k, v := range reselements {
e := a[k].Value().(*big.Int)
assert.Equal(t, int64(v), e.Int64())
}
assert.Equal(t, int64(1), vm.estack.Peek(1).BigInt().Int64())
}
func makeProgram(opcodes ...Instruction) []byte {
prog := make([]byte, len(opcodes)+1) // RET
for i := 0; i < len(opcodes); i++ {