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// Copyright 2017 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 (
"bytes"
"math"
"math/big"
"sort"
"testing"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/params"
)
func TestMemoryGasCost(t *testing.T) {
tests := []struct {
size uint64
cost uint64
overflow bool
}{
{0x1fffffffe0, 36028809887088637, false},
{0x1fffffffe1, 0, true},
}
for i, tt := range tests {
v, err := memoryGasCost(&Memory{}, tt.size)
if (err == ErrGasUintOverflow) != tt.overflow {
t.Errorf("test %d: overflow mismatch: have %v, want %v", i, err == ErrGasUintOverflow, tt.overflow)
}
if v != tt.cost {
t.Errorf("test %d: gas cost mismatch: have %v, want %v", i, v, tt.cost)
}
}
}
var eip2200Tests = []struct {
original byte
gaspool uint64
input string
used uint64
refund uint64
failure error
}{
{0, math.MaxUint64, "0x60006000556000600055", 1612, 0, nil}, // 0 -> 0 -> 0
{0, math.MaxUint64, "0x60006000556001600055", 20812, 0, nil}, // 0 -> 0 -> 1
{0, math.MaxUint64, "0x60016000556000600055", 20812, 19200, nil}, // 0 -> 1 -> 0
{0, math.MaxUint64, "0x60016000556002600055", 20812, 0, nil}, // 0 -> 1 -> 2
{0, math.MaxUint64, "0x60016000556001600055", 20812, 0, nil}, // 0 -> 1 -> 1
{1, math.MaxUint64, "0x60006000556000600055", 5812, 15000, nil}, // 1 -> 0 -> 0
{1, math.MaxUint64, "0x60006000556001600055", 5812, 4200, nil}, // 1 -> 0 -> 1
{1, math.MaxUint64, "0x60006000556002600055", 5812, 0, nil}, // 1 -> 0 -> 2
{1, math.MaxUint64, "0x60026000556000600055", 5812, 15000, nil}, // 1 -> 2 -> 0
{1, math.MaxUint64, "0x60026000556003600055", 5812, 0, nil}, // 1 -> 2 -> 3
{1, math.MaxUint64, "0x60026000556001600055", 5812, 4200, nil}, // 1 -> 2 -> 1
{1, math.MaxUint64, "0x60026000556002600055", 5812, 0, nil}, // 1 -> 2 -> 2
{1, math.MaxUint64, "0x60016000556000600055", 5812, 15000, nil}, // 1 -> 1 -> 0
{1, math.MaxUint64, "0x60016000556002600055", 5812, 0, nil}, // 1 -> 1 -> 2
{1, math.MaxUint64, "0x60016000556001600055", 1612, 0, nil}, // 1 -> 1 -> 1
{0, math.MaxUint64, "0x600160005560006000556001600055", 40818, 19200, nil}, // 0 -> 1 -> 0 -> 1
{1, math.MaxUint64, "0x600060005560016000556000600055", 10818, 19200, nil}, // 1 -> 0 -> 1 -> 0
{1, 2306, "0x6001600055", 2306, 0, ErrOutOfGas}, // 1 -> 1 (2300 sentry + 2xPUSH)
{1, 2307, "0x6001600055", 806, 0, nil}, // 1 -> 1 (2301 sentry + 2xPUSH)
}
func TestEIP2200(t *testing.T) {
for i, tt := range eip2200Tests {
address := common.BytesToAddress([]byte("contract"))
statedb, _ := state.New(types.EmptyRootHash, state.NewDatabase(rawdb.NewMemoryDatabase()), nil)
statedb.CreateAccount(address)
statedb.SetCode(address, hexutil.MustDecode(tt.input))
statedb.SetState(address, common.Hash{}, common.BytesToHash([]byte{tt.original}))
statedb.Finalise(true) // Push the state into the "original" slot
vmctx := BlockContext{
CanTransfer: func(StateDB, common.Address, *big.Int) bool { return true },
Transfer: func(StateDB, common.Address, common.Address, *big.Int) {},
}
vmenv := NewEVM(vmctx, TxContext{}, statedb, params.AllEthashProtocolChanges, Config{ExtraEips: []int{2200}})
_, gas, err := vmenv.Call(AccountRef(common.Address{}), address, nil, tt.gaspool, new(big.Int))
if err != tt.failure {
t.Errorf("test %d: failure mismatch: have %v, want %v", i, err, tt.failure)
}
if used := tt.gaspool - gas; used != tt.used {
t.Errorf("test %d: gas used mismatch: have %v, want %v", i, used, tt.used)
}
if refund := vmenv.StateDB.GetRefund(); refund != tt.refund {
t.Errorf("test %d: gas refund mismatch: have %v, want %v", i, refund, tt.refund)
}
}
}
var createGasTests = []struct {
code string
eip3860 bool
gasUsed uint64
minimumGas uint64
}{
// legacy create(0, 0, 0xc000) without 3860 used
{"0x61C00060006000f0" + "600052" + "60206000F3", false, 41237, 41237},
// legacy create(0, 0, 0xc000) _with_ 3860
{"0x61C00060006000f0" + "600052" + "60206000F3", true, 44309, 44309},
// create2(0, 0, 0xc001, 0) without 3860
{"0x600061C00160006000f5" + "600052" + "60206000F3", false, 50471, 50471},
// create2(0, 0, 0xc001, 0) (too large), with 3860
{"0x600061C00160006000f5" + "600052" + "60206000F3", true, 32012, 100_000},
// create2(0, 0, 0xc000, 0)
// This case is trying to deploy code at (within) the limit
{"0x600061C00060006000f5" + "600052" + "60206000F3", true, 53528, 53528},
// create2(0, 0, 0xc001, 0)
// This case is trying to deploy code exceeding the limit
{"0x600061C00160006000f5" + "600052" + "60206000F3", true, 32024, 100000},
}
func TestCreateGas(t *testing.T) {
for i, tt := range createGasTests {
var gasUsed = uint64(0)
doCheck := func(testGas int) bool {
address := common.BytesToAddress([]byte("contract"))
statedb, _ := state.New(types.EmptyRootHash, state.NewDatabase(rawdb.NewMemoryDatabase()), nil)
statedb.CreateAccount(address)
statedb.SetCode(address, hexutil.MustDecode(tt.code))
statedb.Finalise(true)
vmctx := BlockContext{
CanTransfer: func(StateDB, common.Address, *big.Int) bool { return true },
Transfer: func(StateDB, common.Address, common.Address, *big.Int) {},
BlockNumber: big.NewInt(0),
}
config := Config{}
if tt.eip3860 {
config.ExtraEips = []int{3860}
}
vmenv := NewEVM(vmctx, TxContext{}, statedb, params.AllEthashProtocolChanges, config)
var startGas = uint64(testGas)
ret, gas, err := vmenv.Call(AccountRef(common.Address{}), address, nil, startGas, new(big.Int))
if err != nil {
return false
}
gasUsed = startGas - gas
if len(ret) != 32 {
t.Fatalf("test %d: expected 32 bytes returned, have %d", i, len(ret))
}
if bytes.Equal(ret, make([]byte, 32)) {
// Failure
return false
}
return true
}
minGas := sort.Search(100_000, doCheck)
if uint64(minGas) != tt.minimumGas {
t.Fatalf("test %d: min gas error, want %d, have %d", i, tt.minimumGas, minGas)
}
// If the deployment succeeded, we also check the gas used
if minGas < 100_000 {
if gasUsed != tt.gasUsed {
t.Errorf("test %d: gas used mismatch: have %v, want %v", i, gasUsed, tt.gasUsed)
}
}
}
}