mirror of
https://github.com/nspcc-dev/neo-go.git
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300 lines
7.3 KiB
Go
300 lines
7.3 KiB
Go
package vm
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import (
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"math/big"
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"github.com/CityOfZion/neo-go/pkg/vm/stack"
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)
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// Stack Manipulation Opcodes
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// PushNBytes will Read N Bytes from the script and push it onto the stack
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func PushNBytes(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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val, err := ctx.ReadBytes(int(op))
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if err != nil {
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return FAULT, err
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}
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ba := stack.NewByteArray(val)
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ctx.Estack.Push(ba)
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return NONE, nil
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}
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// ROLL pops an integer n off of the stack and
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// moves the n-item starting from
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// the top of the stack onto the top stack item.
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// Returns an error if the top stack item is not an
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// integer or n-item does not exist.
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func ROLL(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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n, err := ctx.Estack.PopInt()
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if err != nil {
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return FAULT, err
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}
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nItem, err := ctx.Estack.Remove(uint16(n.Value().Int64()))
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(nItem)
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return NONE, nil
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}
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// ROT moves the third top stack item
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// onto the top stack item.
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// Returns an error if the third top stack item
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// does not exist.
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func ROT(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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item, err := ctx.Estack.Remove(2)
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(item)
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return NONE, nil
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}
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// SWAP swaps the second top stack item with
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// the top stack item.
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// Returns an error if the second top stack item
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// does not exist.
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func SWAP(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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item, err := ctx.Estack.Remove(1)
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(item)
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return NONE, nil
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}
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// TUCK copies the top stack item and
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// inserts it before the second top stack item.
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// Returns an error if the stack is empty or
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// len(stack) is less or equal 2.
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func TUCK(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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item, err := ctx.Estack.Peek(0)
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if err != nil {
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return FAULT, err
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}
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ras, err := ctx.Estack.Insert(2, item)
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if err != nil {
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return FAULT, err
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}
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ctx.Estack = *ras
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return NONE, nil
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}
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// DUP duplicates the top stack item.
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// Returns an error if stack is empty.
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func DUP(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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item, err := ctx.Estack.Peek(0)
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(item)
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return NONE, nil
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}
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// XSWAP pops an integer n off of the stack and
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// swaps the n-item from the stack starting from
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// the top of the stack with the top stack item.
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func XSWAP(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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n, err := ctx.Estack.PopInt()
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if err != nil {
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return FAULT, err
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}
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nItem, err := ctx.Estack.Peek(uint16(n.Value().Int64()))
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if err != nil {
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return FAULT, err
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}
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item, err := ctx.Estack.Peek(0)
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if err != nil {
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return FAULT, err
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}
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if err := ctx.Estack.Set(uint16(n.Value().Int64()), item); err != nil {
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return FAULT, err
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}
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if err := ctx.Estack.Set(0, nItem); err != nil {
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return FAULT, err
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}
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return NONE, nil
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}
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// DUPFROMALTSTACK duplicates the item on top of alternative stack and
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// puts it on top of evaluation stack.
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// Returns an error if the alt stack is empty.
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func DUPFROMALTSTACK(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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item, err := ctx.Astack.Peek(0)
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(item)
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return NONE, nil
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}
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// NIP removes the second top stack item.
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// Returns error if the stack item contains
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// only one element.
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func NIP(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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_, err := ctx.Estack.Remove(1)
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if err != nil {
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return FAULT, err
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}
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return NONE, nil
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}
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// OVER copies the second-to-top stack item onto the top.
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// Returns an error if the stack item contains
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// only one element.
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func OVER(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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item, err := ctx.Estack.Peek(1)
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(item)
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return NONE, nil
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}
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// XTUCK pops an integer n off of the stack and
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// inserts the top stack item to the position len(stack)-n in the evaluation stack.
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func XTUCK(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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n, err := ctx.Estack.PopInt()
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if err != nil || n.Value().Int64() < 0 {
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return FAULT, err
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}
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item, err := ctx.Estack.Peek(0)
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if err != nil {
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return FAULT, err
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}
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ras, err := ctx.Estack.Insert(uint16(n.Value().Int64()), item)
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if err != nil {
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return FAULT, err
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}
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ctx.Estack = *ras
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return NONE, nil
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}
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// TOALTSTACK pops an item off of the evaluation stack and
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// pushes it on top of the alternative stack.
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// Returns an error if the alternative stack is empty.
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func TOALTSTACK(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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item, err := ctx.Estack.Pop()
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if err != nil {
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return FAULT, err
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}
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ctx.Astack.Push(item)
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return NONE, nil
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}
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// DEPTH puts the number of stack items onto the stack.
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func DEPTH(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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l := ctx.Estack.Len()
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length, err := stack.NewInt(big.NewInt(int64(l)))
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(length)
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return NONE, nil
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}
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// FROMALTSTACK pops an item off of the alternative stack and
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// pushes it on top of the evaluation stack.
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// Returns an error if the evaluation stack is empty.
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func FROMALTSTACK(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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item, err := ctx.Astack.Pop()
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(item)
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return NONE, nil
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}
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// PICK pops an integer n off of the stack and
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// copies the n-item starting from
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// the top of the stack onto the top stack item.
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// Returns an error if the top stack item is not an
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// integer or n-item does not exist.
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func PICK(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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n, err := ctx.Estack.PopInt()
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if err != nil {
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return FAULT, err
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}
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nItem, err := ctx.Estack.Peek(uint16(n.Value().Int64()))
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Push(nItem)
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return NONE, nil
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}
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// DROP removes the the top stack item.
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// Returns error if the operation Pop cannot
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// be performed.
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func DROP(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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_, err := ctx.Estack.Pop()
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if err != nil {
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return FAULT, err
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}
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return NONE, nil
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}
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// XDROP pops an integer n off of the stack and
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// removes the n-item from the stack starting from
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// the top of the stack.
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func XDROP(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error) {
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n, err := ctx.Estack.PopInt()
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if err != nil {
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return FAULT, err
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}
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ctx.Estack.Remove(uint16(n.Value().Uint64()))
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if err != nil {
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return FAULT, err
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}
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return NONE, nil
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}
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