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https://github.com/nspcc-dev/neo-go.git
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82 lines
2.1 KiB
Go
82 lines
2.1 KiB
Go
package vm
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import (
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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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// 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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// 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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// 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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// 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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