neo-go/pkg/vm/stack/Int.go
decentralisedkev c1b6738bdb
VM: Add basic vm (#166)
* VM:Add abstract stack item

* VM: Add stackItems; Array, Boolean, Int and ByteArray

* VM: Add tests for stack item

* VM: first pass at Random Access Stack object

* VM: Add Sub, Mul, Mod LSH, RSH

* VM: moved test helper functions into separate file

* VM: removed helper functions from stack_test.go

* Add conversions for bytearray and Int stack items

* Add instructions file for vm

* - Add guide to stack readme
- Add testReadInt64

* Add Builder

* Refactor Int, Boolean, ByteArray conversion

* Add Context stack Item

* Add Invocation stack - convenience RAS

* rename testhelper to test_helper

* Move opcode file

* - Add `Add` OpCode
- Add Opcode Function map

* - Add test for math `Add` opcode
- basic opcode execution

* Add popTwoIntegers convenience func

* Add `SUB` Opcode

* Export Context Read methods
- Return errors where failable

* - Add `Op` to handleOP func signature
- Add PushNBytes OPcode

* remove error on NewBoolean
- Expose underlying with Getter on Boolean StackItem
- Add Equals method for ByteArray

* Make Next() method on Context failable, refactor peekContext and Peek

* Add ExecuteOp, Step and Run methods on the VM

* Add Equal Opcode

* Add THROWIFNOT Opcode

* Add RET Opcode

* Refactor PushNBytes Opcode

* refactor Add, Sub to return VMSTATE
add popTwoByteArrays helper function

* Add basic tests for vm

* clarify vm states

* Add astack

* [VM]

Pass ResultStack to the opcode handlers

* [VM]

refactor handlers to have rstack as argument

* [Stack]

- Change RemoveCurrentContext for PopCurrentContext
- Add CopTo method to stack

* [VM]

Add Result stack Len check in simple run test

* [VM] fix typo

* [Peer/Stall]

Change seconds to milliseconds in test
2019-03-18 21:40:21 +00:00

94 lines
2.1 KiB
Go

package stack
import "math/big"
// Int represents an integer on the stack
type Int struct {
*abstractItem
val *big.Int
}
// NewInt will convert a big integer into
// a StackInteger
func NewInt(val *big.Int) (*Int, error) {
return &Int{
abstractItem: &abstractItem{},
val: val,
}, nil
}
// Equal will check if two integers hold equal value
func (i *Int) Equal(s *Int) bool {
if i.val.Cmp(s.val) != 0 {
return false
}
return true
}
// Add will add two stackIntegers together
func (i *Int) Add(s *Int) (*Int, error) {
return &Int{
val: new(big.Int).Add(i.val, s.val),
}, nil
}
// Sub will subtract two stackIntegers together
func (i *Int) Sub(s *Int) (*Int, error) {
return &Int{
val: new(big.Int).Sub(i.val, s.val),
}, nil
}
// Mul will multiply two stackIntegers together
func (i *Int) Mul(s *Int) (*Int, error) {
return &Int{
val: new(big.Int).Mul(i.val, s.val),
}, nil
}
// Mod will take the mod of two stackIntegers together
func (i *Int) Mod(s *Int) (*Int, error) {
return &Int{
val: new(big.Int).Mod(i.val, s.val),
}, nil
}
// Rsh will shift the integer b to the right by `n` bits
func (i *Int) Rsh(n *Int) (*Int, error) {
return &Int{
val: new(big.Int).Rsh(i.val, uint(n.val.Int64())),
}, nil
}
// Lsh will shift the integer b to the left by `n` bits
func (i *Int) Lsh(n *Int) (*Int, error) {
return &Int{
val: new(big.Int).Lsh(i.val, uint(n.val.Int64())),
}, nil
}
// Integer will overwrite the default implementation
// to allow go to cast this item as an integer.
func (i *Int) Integer() (*Int, error) {
return i, nil
}
// ByteArray override the default ByteArray method
// to convert a Integer into a byte Array
func (i *Int) ByteArray() (*ByteArray, error) {
b := i.val.Bytes()
dest := reverse(b)
return NewByteArray(dest), nil
}
//Boolean override the default Boolean method
// to convert an Integer into a Boolean StackItem
func (i *Int) Boolean() (*Boolean, error) {
boolean := (i.val.Int64() != 0)
return NewBoolean(boolean), nil
}
//Value returns the underlying big.Int
func (i *Int) Value() *big.Int {
return i.val
}