342ae7ce7d
The EVM was previously initialised and created for every CALL, CALLCODE, DELEGATECALL and CREATE. This PR changes this behaviour so that the same EVM can be used through the session and beyond as long as the Environment sticks around.
661 lines
21 KiB
Go
661 lines
21 KiB
Go
// Copyright 2014 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(len(env.Db().GetCode(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) {
|
|
off, val := stack.pop().Int64(), stack.pop().Int64()
|
|
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 params.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().Delete(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))
|
|
}
|
|
}
|