forked from TrueCloudLab/neoneo-go
c1b6738bdb
* 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
71 lines
1.5 KiB
Go
71 lines
1.5 KiB
Go
package stack
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import (
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"bytes"
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"errors"
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"math/big"
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"strconv"
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)
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// ByteArray represents a slice of bytes on the stack
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type ByteArray struct {
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*abstractItem
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val []byte
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}
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//NewByteArray returns a ByteArray stack item
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// given a byte slice
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func NewByteArray(val []byte) *ByteArray {
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return &ByteArray{
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&abstractItem{},
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val,
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}
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}
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//ByteArray overrides the default abstractItem Bytes array method
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func (ba *ByteArray) ByteArray() (*ByteArray, error) {
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return ba, nil
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}
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//Equals returns true, if two bytearrays are equal
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func (ba *ByteArray) Equals(other *ByteArray) *Boolean {
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// If either are nil, return false
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if ba == nil || other == nil {
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return NewBoolean(false)
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}
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return NewBoolean(bytes.Equal(ba.val, other.val))
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}
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//Integer overrides the default Integer method to convert an
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// ByteArray Into an integer
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func (ba *ByteArray) Integer() (*Int, error) {
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dest := reverse(ba.val)
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integerVal := new(big.Int).SetBytes(dest)
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return NewInt(integerVal)
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}
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// Boolean will convert a byte array into a boolean stack item
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func (ba *ByteArray) Boolean() (*Boolean, error) {
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boolean, err := strconv.ParseBool(string(ba.val))
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if err != nil {
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return nil, errors.New("cannot convert byte array to a boolean")
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}
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return NewBoolean(boolean), nil
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}
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// XXX: move this into a pkg/util/slice folder
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// Go mod not working
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func reverse(b []byte) []byte {
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if len(b) < 2 {
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return b
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}
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dest := make([]byte, len(b))
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for i, j := 0, len(b)-1; i < j+1; i, j = i+1, j-1 {
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dest[i], dest[j] = b[j], b[i]
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}
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return dest
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}
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