neo-go/pkg/vm/stack/stackitem.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

49 lines
1.5 KiB
Go

package stack
import (
"errors"
)
//Item is an interface which represents object that can be placed on the stack
type Item interface {
Integer() (*Int, error)
Boolean() (*Boolean, error)
ByteArray() (*ByteArray, error)
Array() (*Array, error)
Context() (*Context, error)
}
// Represents an `abstract` stack item
// which will hold default values for stack items
// this is intended to be embedded into types that you will use on the stack
type abstractItem struct{}
// Integer is the default implementation for a stackItem
// Implements Item interface
func (a *abstractItem) Integer() (*Int, error) {
return nil, errors.New("This stack item is not an Integer")
}
// Boolean is the default implementation for a stackItem
// Implements Item interface
func (a *abstractItem) Boolean() (*Boolean, error) {
return nil, errors.New("This stack item is not a Boolean")
}
// ByteArray is the default implementation for a stackItem
// Implements Item interface
func (a *abstractItem) ByteArray() (*ByteArray, error) {
return nil, errors.New("This stack item is not a byte array")
}
// Array is the default implementation for a stackItem
// Implements Item interface
func (a *abstractItem) Array() (*Array, error) {
return nil, errors.New("This stack item is not an array")
}
// Context is the default implementation for a stackItem
// Implements Item interface
func (a *abstractItem) Context() (*Context, error) {
return nil, errors.New("This stack item is not of type context")
}