661 lines
21 KiB
Go
661 lines
21 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package vm
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import (
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"fmt"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/params"
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)
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type programInstruction interface {
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// executes the program instruction and allows the instruction to modify the state of the program
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do(program *Program, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) ([]byte, error)
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// returns whether the program instruction halts the execution of the JIT
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halts() bool
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// Returns the current op code (debugging purposes)
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Op() OpCode
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}
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type instrFn func(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack)
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type instruction struct {
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op OpCode
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pc uint64
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fn instrFn
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data *big.Int
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gas *big.Int
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spop int
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spush int
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returns bool
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}
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func jump(mapping map[uint64]uint64, destinations map[uint64]struct{}, contract *Contract, to *big.Int) (uint64, error) {
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if !validDest(destinations, to) {
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nop := contract.GetOp(to.Uint64())
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return 0, fmt.Errorf("invalid jump destination (%v) %v", nop, to)
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}
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return mapping[to.Uint64()], nil
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}
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func (instr instruction) do(program *Program, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
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// calculate the new memory size and gas price for the current executing opcode
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newMemSize, cost, err := jitCalculateGasAndSize(env, contract, instr, env.Db(), memory, stack)
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if err != nil {
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return nil, err
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}
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// Use the calculated gas. When insufficient gas is present, use all gas and return an
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// Out Of Gas error
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if !contract.UseGas(cost) {
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return nil, OutOfGasError
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}
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// Resize the memory calculated previously
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memory.Resize(newMemSize.Uint64())
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// These opcodes return an argument and are therefor handled
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// differently from the rest of the opcodes
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switch instr.op {
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case JUMP:
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if pos, err := jump(program.mapping, program.destinations, contract, stack.pop()); err != nil {
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return nil, err
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} else {
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*pc = pos
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return nil, nil
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}
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case JUMPI:
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pos, cond := stack.pop(), stack.pop()
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if cond.Cmp(common.BigTrue) >= 0 {
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if pos, err := jump(program.mapping, program.destinations, contract, pos); err != nil {
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return nil, err
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} else {
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*pc = pos
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return nil, nil
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}
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}
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case RETURN:
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offset, size := stack.pop(), stack.pop()
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return memory.GetPtr(offset.Int64(), size.Int64()), nil
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default:
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if instr.fn == nil {
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return nil, fmt.Errorf("Invalid opcode 0x%x", instr.op)
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}
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instr.fn(instr, pc, env, contract, memory, stack)
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}
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*pc++
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return nil, nil
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}
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func (instr instruction) halts() bool {
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return instr.returns
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}
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func (instr instruction) Op() OpCode {
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return instr.op
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}
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func opStaticJump(instr instruction, pc *uint64, ret *big.Int, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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ret.Set(instr.data)
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}
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func opAdd(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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x, y := stack.pop(), stack.pop()
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stack.push(U256(x.Add(x, y)))
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}
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func opSub(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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x, y := stack.pop(), stack.pop()
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stack.push(U256(x.Sub(x, y)))
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}
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func opMul(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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x, y := stack.pop(), stack.pop()
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stack.push(U256(x.Mul(x, y)))
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}
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func opDiv(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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x, y := stack.pop(), stack.pop()
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if y.Cmp(common.Big0) != 0 {
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stack.push(U256(x.Div(x, y)))
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} else {
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stack.push(new(big.Int))
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}
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}
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func opSdiv(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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x, y := S256(stack.pop()), S256(stack.pop())
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if y.Cmp(common.Big0) == 0 {
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stack.push(new(big.Int))
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return
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} else {
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n := new(big.Int)
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if new(big.Int).Mul(x, y).Cmp(common.Big0) < 0 {
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n.SetInt64(-1)
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} else {
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n.SetInt64(1)
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}
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res := x.Div(x.Abs(x), y.Abs(y))
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res.Mul(res, n)
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stack.push(U256(res))
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}
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}
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func opMod(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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x, y := stack.pop(), stack.pop()
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if y.Cmp(common.Big0) == 0 {
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stack.push(new(big.Int))
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} else {
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stack.push(U256(x.Mod(x, y)))
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}
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}
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func opSmod(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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x, y := S256(stack.pop()), S256(stack.pop())
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if y.Cmp(common.Big0) == 0 {
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stack.push(new(big.Int))
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} else {
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n := new(big.Int)
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if x.Cmp(common.Big0) < 0 {
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n.SetInt64(-1)
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} else {
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n.SetInt64(1)
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}
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res := x.Mod(x.Abs(x), y.Abs(y))
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res.Mul(res, n)
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stack.push(U256(res))
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}
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}
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func opExp(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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x, y := stack.pop(), stack.pop()
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stack.push(U256(x.Exp(x, y, Pow256)))
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}
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func opSignExtend(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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back := stack.pop()
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if back.Cmp(big.NewInt(31)) < 0 {
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bit := uint(back.Uint64()*8 + 7)
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num := stack.pop()
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mask := back.Lsh(common.Big1, bit)
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mask.Sub(mask, common.Big1)
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if common.BitTest(num, int(bit)) {
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num.Or(num, mask.Not(mask))
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} else {
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num.And(num, mask)
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}
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stack.push(U256(num))
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}
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}
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func opNot(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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x := stack.pop()
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stack.push(U256(x.Not(x)))
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}
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func opLt(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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x, y := stack.pop(), stack.pop()
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if x.Cmp(y) < 0 {
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stack.push(big.NewInt(1))
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} else {
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stack.push(new(big.Int))
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}
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}
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func opGt(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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x, y := stack.pop(), stack.pop()
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if x.Cmp(y) > 0 {
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stack.push(big.NewInt(1))
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} else {
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stack.push(new(big.Int))
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}
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}
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func opSlt(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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x, y := S256(stack.pop()), S256(stack.pop())
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if x.Cmp(S256(y)) < 0 {
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stack.push(big.NewInt(1))
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} else {
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stack.push(new(big.Int))
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}
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}
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func opSgt(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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x, y := S256(stack.pop()), S256(stack.pop())
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if x.Cmp(y) > 0 {
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stack.push(big.NewInt(1))
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} else {
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stack.push(new(big.Int))
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}
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}
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func opEq(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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x, y := stack.pop(), stack.pop()
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if x.Cmp(y) == 0 {
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stack.push(big.NewInt(1))
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} else {
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stack.push(new(big.Int))
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}
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}
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func opIszero(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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x := stack.pop()
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if x.Cmp(common.Big0) > 0 {
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stack.push(new(big.Int))
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} else {
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stack.push(big.NewInt(1))
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}
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}
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func opAnd(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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x, y := stack.pop(), stack.pop()
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stack.push(x.And(x, y))
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}
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func opOr(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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x, y := stack.pop(), stack.pop()
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stack.push(x.Or(x, y))
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}
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func opXor(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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x, y := stack.pop(), stack.pop()
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stack.push(x.Xor(x, y))
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}
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func opByte(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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th, val := stack.pop(), stack.pop()
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if th.Cmp(big.NewInt(32)) < 0 {
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byte := big.NewInt(int64(common.LeftPadBytes(val.Bytes(), 32)[th.Int64()]))
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stack.push(byte)
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} else {
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stack.push(new(big.Int))
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}
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}
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func opAddmod(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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x, y, z := stack.pop(), stack.pop(), stack.pop()
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if z.Cmp(Zero) > 0 {
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add := x.Add(x, y)
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add.Mod(add, z)
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stack.push(U256(add))
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} else {
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stack.push(new(big.Int))
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}
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}
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func opMulmod(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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x, y, z := stack.pop(), stack.pop(), stack.pop()
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if z.Cmp(Zero) > 0 {
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mul := x.Mul(x, y)
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mul.Mod(mul, z)
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stack.push(U256(mul))
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} else {
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stack.push(new(big.Int))
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}
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}
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func opSha3(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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offset, size := stack.pop(), stack.pop()
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hash := crypto.Keccak256(memory.Get(offset.Int64(), size.Int64()))
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stack.push(common.BytesToBig(hash))
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}
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func opAddress(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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stack.push(common.Bytes2Big(contract.Address().Bytes()))
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}
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func opBalance(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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addr := common.BigToAddress(stack.pop())
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balance := env.Db().GetBalance(addr)
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stack.push(new(big.Int).Set(balance))
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}
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func opOrigin(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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stack.push(env.Origin().Big())
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}
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func opCaller(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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stack.push(contract.Caller().Big())
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}
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func opCallValue(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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stack.push(new(big.Int).Set(contract.value))
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}
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func opCalldataLoad(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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stack.push(common.Bytes2Big(getData(contract.Input, stack.pop(), common.Big32)))
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}
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func opCalldataSize(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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stack.push(big.NewInt(int64(len(contract.Input))))
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}
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func opCalldataCopy(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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var (
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mOff = stack.pop()
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cOff = stack.pop()
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l = stack.pop()
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)
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memory.Set(mOff.Uint64(), l.Uint64(), getData(contract.Input, cOff, l))
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}
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func opExtCodeSize(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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addr := common.BigToAddress(stack.pop())
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l := big.NewInt(int64(env.Db().GetCodeSize(addr)))
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stack.push(l)
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}
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func opCodeSize(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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l := big.NewInt(int64(len(contract.Code)))
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stack.push(l)
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}
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func opCodeCopy(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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var (
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mOff = stack.pop()
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cOff = stack.pop()
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l = stack.pop()
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)
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codeCopy := getData(contract.Code, cOff, l)
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memory.Set(mOff.Uint64(), l.Uint64(), codeCopy)
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}
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func opExtCodeCopy(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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var (
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addr = common.BigToAddress(stack.pop())
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mOff = stack.pop()
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cOff = stack.pop()
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l = stack.pop()
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)
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codeCopy := getData(env.Db().GetCode(addr), cOff, l)
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memory.Set(mOff.Uint64(), l.Uint64(), codeCopy)
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}
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func opGasprice(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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stack.push(new(big.Int).Set(contract.Price))
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}
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func opBlockhash(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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num := stack.pop()
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n := new(big.Int).Sub(env.BlockNumber(), common.Big257)
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if num.Cmp(n) > 0 && num.Cmp(env.BlockNumber()) < 0 {
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stack.push(env.GetHash(num.Uint64()).Big())
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} else {
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stack.push(new(big.Int))
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}
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}
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func opCoinbase(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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stack.push(env.Coinbase().Big())
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}
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func opTimestamp(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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stack.push(U256(new(big.Int).Set(env.Time())))
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}
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func opNumber(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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stack.push(U256(new(big.Int).Set(env.BlockNumber())))
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}
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func opDifficulty(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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stack.push(U256(new(big.Int).Set(env.Difficulty())))
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}
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func opGasLimit(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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stack.push(U256(new(big.Int).Set(env.GasLimit())))
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}
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func opPop(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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stack.pop()
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}
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func opPush(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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stack.push(new(big.Int).Set(instr.data))
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}
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func opDup(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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stack.dup(int(instr.data.Int64()))
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}
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func opSwap(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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stack.swap(int(instr.data.Int64()))
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}
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func opLog(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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n := int(instr.data.Int64())
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topics := make([]common.Hash, n)
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mStart, mSize := stack.pop(), stack.pop()
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for i := 0; i < n; i++ {
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topics[i] = common.BigToHash(stack.pop())
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}
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d := memory.Get(mStart.Int64(), mSize.Int64())
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log := NewLog(contract.Address(), topics, d, env.BlockNumber().Uint64())
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env.AddLog(log)
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}
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func opMload(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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offset := stack.pop()
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val := common.BigD(memory.Get(offset.Int64(), 32))
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stack.push(val)
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}
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func opMstore(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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// pop value of the stack
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mStart, val := stack.pop(), stack.pop()
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memory.Set(mStart.Uint64(), 32, common.BigToBytes(val, 256))
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}
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func opMstore8(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
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off, val := stack.pop().Int64(), stack.pop().Int64()
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memory.store[off] = byte(val & 0xff)
|
|
}
|
|
|
|
func opSload(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
|
|
loc := common.BigToHash(stack.pop())
|
|
val := env.Db().GetState(contract.Address(), loc).Big()
|
|
stack.push(val)
|
|
}
|
|
|
|
func opSstore(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
|
|
loc := common.BigToHash(stack.pop())
|
|
val := stack.pop()
|
|
env.Db().SetState(contract.Address(), loc, common.BigToHash(val))
|
|
}
|
|
|
|
func opJump(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
|
|
}
|
|
func opJumpi(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
|
|
}
|
|
func opJumpdest(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
|
|
}
|
|
|
|
func opPc(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
|
|
stack.push(new(big.Int).Set(instr.data))
|
|
}
|
|
|
|
func opMsize(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
|
|
stack.push(big.NewInt(int64(memory.Len())))
|
|
}
|
|
|
|
func opGas(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
|
|
stack.push(new(big.Int).Set(contract.Gas))
|
|
}
|
|
|
|
func opCreate(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
|
|
var (
|
|
value = stack.pop()
|
|
offset, size = stack.pop(), stack.pop()
|
|
input = memory.Get(offset.Int64(), size.Int64())
|
|
gas = new(big.Int).Set(contract.Gas)
|
|
)
|
|
contract.UseGas(contract.Gas)
|
|
_, addr, suberr := env.Create(contract, input, gas, contract.Price, value)
|
|
// Push item on the stack based on the returned error. If the ruleset is
|
|
// homestead we must check for CodeStoreOutOfGasError (homestead only
|
|
// rule) and treat as an error, if the ruleset is frontier we must
|
|
// ignore this error and pretend the operation was successful.
|
|
if env.RuleSet().IsHomestead(env.BlockNumber()) && suberr == CodeStoreOutOfGasError {
|
|
stack.push(new(big.Int))
|
|
} else if suberr != nil && suberr != CodeStoreOutOfGasError {
|
|
stack.push(new(big.Int))
|
|
} else {
|
|
stack.push(addr.Big())
|
|
}
|
|
}
|
|
|
|
func opCall(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
|
|
gas := stack.pop()
|
|
// pop gas and value of the stack.
|
|
addr, value := stack.pop(), stack.pop()
|
|
value = U256(value)
|
|
// pop input size and offset
|
|
inOffset, inSize := stack.pop(), stack.pop()
|
|
// pop return size and offset
|
|
retOffset, retSize := stack.pop(), stack.pop()
|
|
|
|
address := common.BigToAddress(addr)
|
|
|
|
// Get the arguments from the memory
|
|
args := memory.Get(inOffset.Int64(), inSize.Int64())
|
|
|
|
if len(value.Bytes()) > 0 {
|
|
gas.Add(gas, params.CallStipend)
|
|
}
|
|
|
|
ret, err := env.Call(contract, address, args, gas, contract.Price, value)
|
|
|
|
if err != nil {
|
|
stack.push(new(big.Int))
|
|
|
|
} else {
|
|
stack.push(big.NewInt(1))
|
|
|
|
memory.Set(retOffset.Uint64(), retSize.Uint64(), ret)
|
|
}
|
|
}
|
|
|
|
func opCallCode(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
|
|
gas := stack.pop()
|
|
// pop gas and value of the stack.
|
|
addr, value := stack.pop(), stack.pop()
|
|
value = U256(value)
|
|
// pop input size and offset
|
|
inOffset, inSize := stack.pop(), stack.pop()
|
|
// pop return size and offset
|
|
retOffset, retSize := stack.pop(), stack.pop()
|
|
|
|
address := common.BigToAddress(addr)
|
|
|
|
// Get the arguments from the memory
|
|
args := memory.Get(inOffset.Int64(), inSize.Int64())
|
|
|
|
if len(value.Bytes()) > 0 {
|
|
gas.Add(gas, params.CallStipend)
|
|
}
|
|
|
|
ret, err := env.CallCode(contract, address, args, gas, contract.Price, value)
|
|
|
|
if err != nil {
|
|
stack.push(new(big.Int))
|
|
|
|
} else {
|
|
stack.push(big.NewInt(1))
|
|
|
|
memory.Set(retOffset.Uint64(), retSize.Uint64(), ret)
|
|
}
|
|
}
|
|
|
|
func opDelegateCall(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
|
|
gas, to, inOffset, inSize, outOffset, outSize := stack.pop(), stack.pop(), stack.pop(), stack.pop(), stack.pop(), stack.pop()
|
|
|
|
toAddr := common.BigToAddress(to)
|
|
args := memory.Get(inOffset.Int64(), inSize.Int64())
|
|
ret, err := env.DelegateCall(contract, toAddr, args, gas, contract.Price)
|
|
if err != nil {
|
|
stack.push(new(big.Int))
|
|
} else {
|
|
stack.push(big.NewInt(1))
|
|
memory.Set(outOffset.Uint64(), outSize.Uint64(), ret)
|
|
}
|
|
}
|
|
|
|
func opReturn(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
|
|
}
|
|
func opStop(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
|
|
}
|
|
|
|
func opSuicide(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
|
|
balance := env.Db().GetBalance(contract.Address())
|
|
env.Db().AddBalance(common.BigToAddress(stack.pop()), balance)
|
|
|
|
env.Db().Suicide(contract.Address())
|
|
}
|
|
|
|
// following functions are used by the instruction jump table
|
|
|
|
// make log instruction function
|
|
func makeLog(size int) instrFn {
|
|
return func(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
|
|
topics := make([]common.Hash, size)
|
|
mStart, mSize := stack.pop(), stack.pop()
|
|
for i := 0; i < size; i++ {
|
|
topics[i] = common.BigToHash(stack.pop())
|
|
}
|
|
|
|
d := memory.Get(mStart.Int64(), mSize.Int64())
|
|
log := NewLog(contract.Address(), topics, d, env.BlockNumber().Uint64())
|
|
env.AddLog(log)
|
|
}
|
|
}
|
|
|
|
// make push instruction function
|
|
func makePush(size uint64, bsize *big.Int) instrFn {
|
|
return func(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
|
|
byts := getData(contract.Code, new(big.Int).SetUint64(*pc+1), bsize)
|
|
stack.push(common.Bytes2Big(byts))
|
|
*pc += size
|
|
}
|
|
}
|
|
|
|
// make push instruction function
|
|
func makeDup(size int64) instrFn {
|
|
return func(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
|
|
stack.dup(int(size))
|
|
}
|
|
}
|
|
|
|
// make swap instruction function
|
|
func makeSwap(size int64) instrFn {
|
|
// switch n + 1 otherwise n would be swapped with n
|
|
size += 1
|
|
return func(instr instruction, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) {
|
|
stack.swap(int(size))
|
|
}
|
|
}
|