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vm: add XDROP implementation

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This commit is contained in:
Roman Khimov 2019-09-05 16:42:54 +03:00
parent 974f5db6bc
commit b494e094c0
2 changed files with 48 additions and 0 deletions
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10
pkg/vm/vm.go
View file

@ -300,6 +300,16 @@ func (v *VM) execute(ctx *Context, op Instruction) {
}
v.estack.InsertAt(a, 2)
case XDROP:
n := int(v.estack.Pop().BigInt().Int64())
if n < 0 {
panic("invalid length")
}
e := v.estack.RemoveAt(n)
if e == nil {
panic("bad index")
}
case XSWAP:
n := int(v.estack.Pop().BigInt().Int64())
if n < 0 {

38
pkg/vm/vm_test.go
View file

@ -408,6 +408,44 @@ func TestOVERgood(t *testing.T) {
assert.Equal(t, 3, vm.estack.Len())
}
func TestXDROPbadNoitem(t *testing.T) {
prog := makeProgram(XDROP)
vm := load(prog)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestXDROPbadNoN(t *testing.T) {
prog := makeProgram(XDROP)
vm := load(prog)
vm.estack.PushVal(1)
vm.estack.PushVal(2)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestXDROPbadNegative(t *testing.T) {
prog := makeProgram(XDROP)
vm := load(prog)
vm.estack.PushVal(1)
vm.estack.PushVal(-1)
vm.Run()
assert.Equal(t, true, vm.state.HasFlag(faultState))
}
func TestXDROPgood(t *testing.T) {
prog := makeProgram(XDROP)
vm := load(prog)
vm.estack.PushVal(0)
vm.estack.PushVal(1)
vm.estack.PushVal(2)
vm.estack.PushVal(2)
vm.Run()
assert.Equal(t, false, vm.state.HasFlag(faultState))
assert.Equal(t, 2, vm.estack.Len())
assert.Equal(t, int64(2), vm.estack.Peek(0).BigInt().Int64())
assert.Equal(t, int64(1), vm.estack.Peek(1).BigInt().Int64())
}
func makeProgram(opcodes ...Instruction) []byte {
prog := make([]byte, len(opcodes)+1) // RET