// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package vm
import (
"fmt"
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/math"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/params"
)
var bigZero = new(big.Int)
func opAdd(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
x, y := stack.pop(), stack.pop()
stack.push(U256(x.Add(x, y)))
evm.interpreter.intPool.put(y)
return nil, nil
}
func opSub(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
x, y := stack.pop(), stack.pop()
stack.push(U256(x.Sub(x, y)))
evm.interpreter.intPool.put(y)
return nil, nil
}
func opMul(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
x, y := stack.pop(), stack.pop()
stack.push(U256(x.Mul(x, y)))
evm.interpreter.intPool.put(y)
return nil, nil
}
func opDiv(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
x, y := stack.pop(), stack.pop()
if y.Cmp(common.Big0) != 0 {
stack.push(U256(x.Div(x, y)))
} else {
stack.push(new(big.Int))
}
evm.interpreter.intPool.put(y)
return nil, nil
}
func opSdiv(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
x, y := S256(stack.pop()), S256(stack.pop())
if y.Cmp(common.Big0) == 0 {
stack.push(new(big.Int))
return nil, nil
} else {
n := new(big.Int)
if evm.interpreter.intPool.get().Mul(x, y).Cmp(common.Big0) < 0 {
n.SetInt64(-1)
} else {
n.SetInt64(1)
}
res := x.Div(x.Abs(x), y.Abs(y))
res.Mul(res, n)
stack.push(U256(res))
}
evm.interpreter.intPool.put(y)
return nil, nil
}
func opMod(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
x, y := stack.pop(), stack.pop()
if y.Cmp(common.Big0) == 0 {
stack.push(new(big.Int))
} else {
stack.push(U256(x.Mod(x, y)))
}
evm.interpreter.intPool.put(y)
return nil, nil
}
func opSmod(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
x, y := S256(stack.pop()), S256(stack.pop())
if y.Cmp(common.Big0) == 0 {
stack.push(new(big.Int))
} else {
n := new(big.Int)
if x.Cmp(common.Big0) < 0 {
n.SetInt64(-1)
} else {
n.SetInt64(1)
}
res := x.Mod(x.Abs(x), y.Abs(y))
res.Mul(res, n)
stack.push(U256(res))
}
evm.interpreter.intPool.put(y)
return nil, nil
}
func opExp(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
base, exponent := stack.pop(), stack.pop()
stack.push(math.Exp(base, exponent))
evm.interpreter.intPool.put(base, exponent)
return nil, nil
}
func opSignExtend(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
back := stack.pop()
if back.Cmp(big.NewInt(31)) < 0 {
bit := uint(back.Uint64()*8 + 7)
num := stack.pop()
mask := back.Lsh(common.Big1, bit)
mask.Sub(mask, common.Big1)
if common.BitTest(num, int(bit)) {
num.Or(num, mask.Not(mask))
} else {
num.And(num, mask)
}
stack.push(U256(num))
}
evm.interpreter.intPool.put(back)
return nil, nil
}
func opNot(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
x := stack.pop()
stack.push(U256(x.Not(x)))
return nil, nil
}
func opLt(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
x, y := stack.pop(), stack.pop()
if x.Cmp(y) < 0 {
stack.push(evm.interpreter.intPool.get().SetUint64(1))
} else {
stack.push(new(big.Int))
}
evm.interpreter.intPool.put(x, y)
return nil, nil
}
func opGt(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
x, y := stack.pop(), stack.pop()
if x.Cmp(y) > 0 {
stack.push(evm.interpreter.intPool.get().SetUint64(1))
} else {
stack.push(new(big.Int))
}
evm.interpreter.intPool.put(x, y)
return nil, nil
}
func opSlt(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
x, y := S256(stack.pop()), S256(stack.pop())
if x.Cmp(S256(y)) < 0 {
stack.push(evm.interpreter.intPool.get().SetUint64(1))
} else {
stack.push(new(big.Int))
}
evm.interpreter.intPool.put(x, y)
return nil, nil
}
func opSgt(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
x, y := S256(stack.pop()), S256(stack.pop())
if x.Cmp(y) > 0 {
stack.push(evm.interpreter.intPool.get().SetUint64(1))
} else {
stack.push(new(big.Int))
}
evm.interpreter.intPool.put(x, y)
return nil, nil
}
func opEq(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
x, y := stack.pop(), stack.pop()
if x.Cmp(y) == 0 {
stack.push(evm.interpreter.intPool.get().SetUint64(1))
} else {
stack.push(new(big.Int))
}
evm.interpreter.intPool.put(x, y)
return nil, nil
}
func opIszero(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
x := stack.pop()
if x.Cmp(common.Big0) > 0 {
stack.push(new(big.Int))
} else {
stack.push(evm.interpreter.intPool.get().SetUint64(1))
}
evm.interpreter.intPool.put(x)
return nil, nil
}
func opAnd(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
x, y := stack.pop(), stack.pop()
stack.push(x.And(x, y))
evm.interpreter.intPool.put(y)
return nil, nil
}
func opOr(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
x, y := stack.pop(), stack.pop()
stack.push(x.Or(x, y))
evm.interpreter.intPool.put(y)
return nil, nil
}
func opXor(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
x, y := stack.pop(), stack.pop()
stack.push(x.Xor(x, y))
evm.interpreter.intPool.put(y)
return nil, nil
}
func opByte(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
th, val := stack.pop(), stack.pop()
if th.Cmp(big.NewInt(32)) < 0 {
byte := evm.interpreter.intPool.get().SetInt64(int64(common.LeftPadBytes(val.Bytes(), 32)[th.Int64()]))
stack.push(byte)
} else {
stack.push(new(big.Int))
}
evm.interpreter.intPool.put(th, val)
return nil, nil
}
func opAddmod(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
x, y, z := stack.pop(), stack.pop(), stack.pop()
if z.Cmp(bigZero) > 0 {
add := x.Add(x, y)
add.Mod(add, z)
stack.push(U256(add))
} else {
stack.push(new(big.Int))
}
evm.interpreter.intPool.put(y, z)
return nil, nil
}
func opMulmod(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
x, y, z := stack.pop(), stack.pop(), stack.pop()
if z.Cmp(bigZero) > 0 {
mul := x.Mul(x, y)
mul.Mod(mul, z)
stack.push(U256(mul))
} else {
stack.push(new(big.Int))
}
evm.interpreter.intPool.put(y, z)
return nil, nil
}
func opSha3(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
offset, size := stack.pop(), stack.pop()
data := memory.Get(offset.Int64(), size.Int64())
hash := crypto.Keccak256(data)
if evm.vmConfig.EnablePreimageRecording {
evm.StateDB.AddPreimage(common.BytesToHash(hash), data)
}
stack.push(common.BytesToBig(hash))
evm.interpreter.intPool.put(offset, size)
return nil, nil
}
func opAddress(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
stack.push(common.Bytes2Big(contract.Address().Bytes()))
return nil, nil
}
func opBalance(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
addr := common.BigToAddress(stack.pop())
balance := evm.StateDB.GetBalance(addr)
stack.push(new(big.Int).Set(balance))
return nil, nil
}
func opOrigin(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
stack.push(evm.Origin.Big())
return nil, nil
}
func opCaller(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
stack.push(contract.Caller().Big())
return nil, nil
}
func opCallValue(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
stack.push(evm.interpreter.intPool.get().Set(contract.value))
return nil, nil
}
func opCalldataLoad(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
stack.push(common.Bytes2Big(getData(contract.Input, stack.pop(), common.Big32)))
return nil, nil
}
func opCalldataSize(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
stack.push(evm.interpreter.intPool.get().SetInt64(int64(len(contract.Input))))
return nil, nil
}
func opCalldataCopy(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
var (
mOff = stack.pop()
cOff = stack.pop()
l = stack.pop()
)
memory.Set(mOff.Uint64(), l.Uint64(), getData(contract.Input, cOff, l))
evm.interpreter.intPool.put(mOff, cOff, l)
return nil, nil
}
func opExtCodeSize(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
a := stack.pop()
addr := common.BigToAddress(a)
a.SetInt64(int64(evm.StateDB.GetCodeSize(addr)))
stack.push(a)
return nil, nil
}
func opCodeSize(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
l := evm.interpreter.intPool.get().SetInt64(int64(len(contract.Code)))
stack.push(l)
return nil, nil
}
func opCodeCopy(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
var (
mOff = stack.pop()
cOff = stack.pop()
l = stack.pop()
)
codeCopy := getData(contract.Code, cOff, l)
memory.Set(mOff.Uint64(), l.Uint64(), codeCopy)
evm.interpreter.intPool.put(mOff, cOff, l)
return nil, nil
}
func opExtCodeCopy(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
var (
addr = common.BigToAddress(stack.pop())
mOff = stack.pop()
cOff = stack.pop()
l = stack.pop()
)
codeCopy := getData(evm.StateDB.GetCode(addr), cOff, l)
memory.Set(mOff.Uint64(), l.Uint64(), codeCopy)
evm.interpreter.intPool.put(mOff, cOff, l)
return nil, nil
}
func opGasprice(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
stack.push(evm.interpreter.intPool.get().Set(evm.GasPrice))
return nil, nil
}
func opBlockhash(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
num := stack.pop()
n := evm.interpreter.intPool.get().Sub(evm.BlockNumber, common.Big257)
if num.Cmp(n) > 0 && num.Cmp(evm.BlockNumber) < 0 {
stack.push(evm.GetHash(num.Uint64()).Big())
} else {
stack.push(new(big.Int))
}
evm.interpreter.intPool.put(num, n)
return nil, nil
}
func opCoinbase(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
stack.push(evm.Coinbase.Big())
return nil, nil
}
func opTimestamp(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
stack.push(U256(new(big.Int).Set(evm.Time)))
return nil, nil
}
func opNumber(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
stack.push(U256(new(big.Int).Set(evm.BlockNumber)))
return nil, nil
}
func opDifficulty(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
stack.push(U256(new(big.Int).Set(evm.Difficulty)))
return nil, nil
}
func opGasLimit(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
stack.push(U256(new(big.Int).Set(evm.GasLimit)))
return nil, nil
}
func opPop(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
evm.interpreter.intPool.put(stack.pop())
return nil, nil
}
func opMload(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
offset := stack.pop()
val := common.BigD(memory.Get(offset.Int64(), 32))
stack.push(val)
evm.interpreter.intPool.put(offset)
return nil, nil
}
func opMstore(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
// pop value of the stack
mStart, val := stack.pop(), stack.pop()
memory.Set(mStart.Uint64(), 32, common.BigToBytes(val, 256))
evm.interpreter.intPool.put(mStart, val)
return nil, nil
}
func opMstore8(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
off, val := stack.pop().Int64(), stack.pop().Int64()
memory.store[off] = byte(val & 0xff)
return nil, nil
}
func opSload(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
loc := common.BigToHash(stack.pop())
val := evm.StateDB.GetState(contract.Address(), loc).Big()
stack.push(val)
return nil, nil
}
func opSstore(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
loc := common.BigToHash(stack.pop())
val := stack.pop()
evm.StateDB.SetState(contract.Address(), loc, common.BigToHash(val))
evm.interpreter.intPool.put(val)
return nil, nil
}
func opJump(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
pos := stack.pop()
if !contract.jumpdests.has(contract.CodeHash, contract.Code, pos) {
nop := contract.GetOp(pos.Uint64())
return nil, fmt.Errorf("invalid jump destination (%v) %v", nop, pos)
}
*pc = pos.Uint64()
evm.interpreter.intPool.put(pos)
return nil, nil
}
func opJumpi(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
pos, cond := stack.pop(), stack.pop()
if cond.Cmp(common.BigTrue) >= 0 {
if !contract.jumpdests.has(contract.CodeHash, contract.Code, pos) {
nop := contract.GetOp(pos.Uint64())
return nil, fmt.Errorf("invalid jump destination (%v) %v", nop, pos)
}
*pc = pos.Uint64()
} else {
*pc++
}
evm.interpreter.intPool.put(pos, cond)
return nil, nil
}
func opJumpdest(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
return nil, nil
}
func opPc(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
stack.push(evm.interpreter.intPool.get().SetUint64(*pc))
return nil, nil
}
func opMsize(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
stack.push(evm.interpreter.intPool.get().SetInt64(int64(memory.Len())))
return nil, nil
}
func opGas(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
stack.push(evm.interpreter.intPool.get().SetUint64(contract.Gas))
return nil, nil
}
func opCreate(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
var (
value = stack.pop()
offset, size = stack.pop(), stack.pop()
input = memory.Get(offset.Int64(), size.Int64())
gas = contract.Gas
)
if evm.ChainConfig().IsEIP150(evm.BlockNumber) {
gas -= gas / 64
}
contract.UseGas(gas)
_, addr, returnGas, suberr := evm.Create(contract, input, gas, 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 evm.ChainConfig().IsHomestead(evm.BlockNumber) && suberr == ErrCodeStoreOutOfGas {
stack.push(new(big.Int))
} else if suberr != nil && suberr != ErrCodeStoreOutOfGas {
stack.push(new(big.Int))
} else {
stack.push(addr.Big())
}
contract.Gas += returnGas
evm.interpreter.intPool.put(value, offset, size)
return nil, nil
}
func opCall(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
gas := stack.pop().Uint64()
// 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 value.BitLen() > 0 {
gas += params.CallStipend
}
ret, returnGas, err := evm.Call(contract, address, args, gas, value)
if err != nil {
stack.push(new(big.Int))
} else {
stack.push(big.NewInt(1))
memory.Set(retOffset.Uint64(), retSize.Uint64(), ret)
}
contract.Gas += returnGas
evm.interpreter.intPool.put(addr, value, inOffset, inSize, retOffset, retSize)
return nil, nil
}
func opCallCode(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
gas := stack.pop().Uint64()
// 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 value.BitLen() > 0 {
gas += params.CallStipend
}
ret, returnGas, err := evm.CallCode(contract, address, args, gas, value)
if err != nil {
stack.push(new(big.Int))
} else {
stack.push(big.NewInt(1))
memory.Set(retOffset.Uint64(), retSize.Uint64(), ret)
}
contract.Gas += returnGas
evm.interpreter.intPool.put(addr, value, inOffset, inSize, retOffset, retSize)
return nil, nil
}
func opDelegateCall(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
// if not homestead return an error. DELEGATECALL is not supported
// during pre-homestead.
if !evm.ChainConfig().IsHomestead(evm.BlockNumber) {
return nil, fmt.Errorf("invalid opcode %x", DELEGATECALL)
}
gas, to, inOffset, inSize, outOffset, outSize := stack.pop().Uint64(), stack.pop(), stack.pop(), stack.pop(), stack.pop(), stack.pop()
toAddr := common.BigToAddress(to)
args := memory.Get(inOffset.Int64(), inSize.Int64())
ret, returnGas, err := evm.DelegateCall(contract, toAddr, args, gas)
if err != nil {
stack.push(new(big.Int))
} else {
stack.push(big.NewInt(1))
memory.Set(outOffset.Uint64(), outSize.Uint64(), ret)
}
contract.Gas += returnGas
evm.interpreter.intPool.put(to, inOffset, inSize, outOffset, outSize)
return nil, nil
}
func opReturn(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
offset, size := stack.pop(), stack.pop()
ret := memory.GetPtr(offset.Int64(), size.Int64())
evm.interpreter.intPool.put(offset, size)
return ret, nil
}
func opStop(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
return nil, nil
}
func opSuicide(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
balance := evm.StateDB.GetBalance(contract.Address())
evm.StateDB.AddBalance(common.BigToAddress(stack.pop()), balance)
evm.StateDB.Suicide(contract.Address())
return nil, nil
}
// following functions are used by the instruction jump table
// make log instruction function
func makeLog(size int) executionFunc {
return func(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
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())
evm.StateDB.AddLog(&types.Log{
Address: contract.Address(),
Topics: topics,
Data: d,
// This is a non-consensus field, but assigned here because
// core/state doesn't know the current block number.
BlockNumber: evm.BlockNumber.Uint64(),
})
evm.interpreter.intPool.put(mStart, mSize)
return nil, nil
}
}
// make push instruction function
func makePush(size uint64, bsize *big.Int) executionFunc {
return func(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
byts := getData(contract.Code, evm.interpreter.intPool.get().SetUint64(*pc+1), bsize)
stack.push(common.Bytes2Big(byts))
*pc += size
return nil, nil
}
}
// make push instruction function
func makeDup(size int64) executionFunc {
return func(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
stack.dup(int(size))
return nil, nil
}
}
// make swap instruction function
func makeSwap(size int64) executionFunc {
// switch n + 1 otherwise n would be swapped with n
size += 1
return func(pc *uint64, evm *EVM, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
stack.swap(int(size))
return nil, nil
}
}