path: root/tests/vm_test_util.go

// 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 tests

import (
    "bytes"
    "fmt"
    "io"
    "math/big"
    "strconv"
    "testing"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/core/state"
    "github.com/ethereum/go-ethereum/core/vm"
    "github.com/ethereum/go-ethereum/ethdb"
    "github.com/ethereum/go-ethereum/logger/glog"
    "github.com/ethereum/go-ethereum/params"
)

func RunVmTestWithReader(r io.Reader, skipTests []string) error {
    tests := make(map[string]VmTest)
    err := readJson(r, &tests)
    if err != nil {
        return err
    }

    if err != nil {
        return err
    }

    if err := runVmTests(tests, skipTests); err != nil {
        return err
    }

    return nil
}

type bconf struct {
    name    string
    precomp bool
    jit     bool
}

func BenchVmTest(p string, conf bconf, b *testing.B) error {
    tests := make(map[string]VmTest)
    err := readJsonFile(p, &tests)
    if err != nil {
        return err
    }

    test, ok := tests[conf.name]
    if !ok {
        return fmt.Errorf("test not found: %s", conf.name)
    }

    env := make(map[string]string)
    env["currentCoinbase"] = test.Env.CurrentCoinbase
    env["currentDifficulty"] = test.Env.CurrentDifficulty
    env["currentGasLimit"] = test.Env.CurrentGasLimit
    env["currentNumber"] = test.Env.CurrentNumber
    env["previousHash"] = test.Env.PreviousHash
    if n, ok := test.Env.CurrentTimestamp.(float64); ok {
        env["currentTimestamp"] = strconv.Itoa(int(n))
    } else {
        env["currentTimestamp"] = test.Env.CurrentTimestamp.(string)
    }

    /*
        if conf.precomp {
            program := vm.NewProgram(test.code)
            err := vm.AttachProgram(program)
            if err != nil {
                return err
            }
        }
    */

    b.ResetTimer()
    for i := 0; i < b.N; i++ {
        benchVmTest(test, env, b)
    }

    return nil
}

func benchVmTest(test VmTest, env map[string]string, b *testing.B) {
    b.StopTimer()
    db, _ := ethdb.NewMemDatabase()
    statedb := makePreState(db, test.Pre)
    b.StartTimer()

    RunVm(statedb, env, test.Exec)
}

func RunVmTest(p string, skipTests []string) error {
    tests := make(map[string]VmTest)
    err := readJsonFile(p, &tests)
    if err != nil {
        return err
    }

    if err := runVmTests(tests, skipTests); err != nil {
        return err
    }

    return nil
}

func runVmTests(tests map[string]VmTest, skipTests []string) error {
    skipTest := make(map[string]bool, len(skipTests))
    for _, name := range skipTests {
        skipTest[name] = true
    }

    for name, test := range tests {
        if skipTest[name] {
            glog.Infoln("Skipping VM test", name)
            return nil
        }

        if err := runVmTest(test); err != nil {
            return fmt.Errorf("%s %s", name, err.Error())
        }

        glog.Infoln("VM test passed: ", name)
        //fmt.Println(string(statedb.Dump()))
    }
    return nil
}

func runVmTest(test VmTest) error {
    db, _ := ethdb.NewMemDatabase()
    statedb := makePreState(db, test.Pre)

    // XXX Yeah, yeah...
    env := make(map[string]string)
    env["currentCoinbase"] = test.Env.CurrentCoinbase
    env["currentDifficulty"] = test.Env.CurrentDifficulty
    env["currentGasLimit"] = test.Env.CurrentGasLimit
    env["currentNumber"] = test.Env.CurrentNumber
    env["previousHash"] = test.Env.PreviousHash
    if n, ok := test.Env.CurrentTimestamp.(float64); ok {
        env["currentTimestamp"] = strconv.Itoa(int(n))
    } else {
        env["currentTimestamp"] = test.Env.CurrentTimestamp.(string)
    }

    var (
        ret  []byte
        gas  *big.Int
        err  error
        logs vm.Logs
    )

    ret, logs, gas, err = RunVm(statedb, env, test.Exec)

    // Compare expected and actual return
    rexp := common.FromHex(test.Out)
    if bytes.Compare(rexp, ret) != 0 {
        return fmt.Errorf("return failed. Expected %x, got %x\n", rexp, ret)
    }

    // Check gas usage
    if len(test.Gas) == 0 && err == nil {
        return fmt.Errorf("gas unspecified, indicating an error. VM returned (incorrectly) successfull")
    } else {
        gexp := common.Big(test.Gas)
        if gexp.Cmp(gas) != 0 {
            return fmt.Errorf("gas failed. Expected %v, got %v\n", gexp, gas)
        }
    }

    // check post state
    for addr, account := range test.Post {
        obj := statedb.GetStateObject(common.HexToAddress(addr))
        if obj == nil {
            continue
        }
        for addr, value := range account.Storage {
            v := statedb.GetState(obj.Address(), common.HexToHash(addr))
            vexp := common.HexToHash(value)
            if v != vexp {
                return fmt.Errorf("(%x: %s) storage failed. Expected %x, got %x (%v %v)\n", obj.Address().Bytes()[0:4], addr, vexp, v, vexp.Big(), v.Big())
            }
        }
    }

    // check logs
    if len(test.Logs) > 0 {
        lerr := checkLogs(test.Logs, logs)
        if lerr != nil {
            return lerr
        }
    }

    return nil
}

func RunVm(state *state.StateDB, env, exec map[string]string) ([]byte, vm.Logs, *big.Int, error) {
    var (
        to    = common.HexToAddress(exec["address"])
        from  = common.HexToAddress(exec["caller"])
        data  = common.FromHex(exec["data"])
        gas   = common.Big(exec["gas"])
        price = common.Big(exec["gasPrice"])
        value = common.Big(exec["value"])
    )
    // Reset the pre-compiled contracts for VM tests.
    vm.Precompiled = make(map[string]*vm.PrecompiledAccount)

    caller := state.GetOrNewStateObject(from)

    vmenv := NewEnvFromMap(RuleSet{params.MainNetHomesteadBlock, params.MainNetDAOForkBlock, true, nil}, state, env, exec)
    vmenv.vmTest = true
    vmenv.skipTransfer = true
    vmenv.initial = true
    ret, err := vmenv.Call(caller, to, data, gas, price, value)

    return ret, vmenv.state.Logs(), vmenv.Gas, err
}