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Geth-Modification
Unverified Commit 6b9c77f0 authored by Martin Holst Swende's avatar Martin Holst Swende Committed by GitHub
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eth/tracers: package restructuring (#23857) 

* eth/tracers: restructure tracer package

* core/vm/runtime: load js tracers

* eth/tracers: mv bigint js code to own file

* eth/tracers: add method docs for native tracers

* eth/tracers: minor doc fix

* core,eth: cancel evm on nativecalltracer stop

* core/vm: fix failing test
Co-authored-by: 's avatarSina Mahmoodi <itz.s1na@gmail.com>
parent 94898533
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Showing with 1392 additions and 1388 deletions
cmd/geth/main.go
View file @ 6b9c77f0
......@@ -40,7 +40,8 @@ import (
"github.com/ethereum/go-ethereum/metrics"
"github.com/ethereum/go-ethereum/node"
// Force-load the native, to trigger registration
// Force-load the tracer engines to trigger registration
_ "github.com/ethereum/go-ethereum/eth/tracers/js"
_ "github.com/ethereum/go-ethereum/eth/tracers/native"
"gopkg.in/urfave/cli.v1"
......
core/vm/access_list_tracer.go
View file @ 6b9c77f0
......@@ -141,7 +141,7 @@ func (a *AccessListTracer) CaptureStart(env *EVM, from common.Address, to common
}
// CaptureState captures all opcodes that touch storage or addresses and adds them to the accesslist.
func (a *AccessListTracer) CaptureState(env *EVM, pc uint64, op OpCode, gas, cost uint64, scope *ScopeContext, rData []byte, depth int, err error) {
func (a *AccessListTracer) CaptureState(pc uint64, op OpCode, gas, cost uint64, scope *ScopeContext, rData []byte, depth int, err error) {
stack := scope.Stack
if (op == SLOAD || op == SSTORE) && stack.len() >= 1 {
slot := common.Hash(stack.data[stack.len()-1].Bytes32())
......@@ -161,7 +161,7 @@ func (a *AccessListTracer) CaptureState(env *EVM, pc uint64, op OpCode, gas, cos
}
}
func (*AccessListTracer) CaptureFault(env *EVM, pc uint64, op OpCode, gas, cost uint64, scope *ScopeContext, depth int, err error) {
func (*AccessListTracer) CaptureFault(pc uint64, op OpCode, gas, cost uint64, scope *ScopeContext, depth int, err error) {
}
func (*AccessListTracer) CaptureEnd(output []byte, gasUsed uint64, t time.Duration, err error) {}
......
core/vm/interpreter.go
View file @ 6b9c77f0
......@@ -169,9 +169,9 @@ func (in *EVMInterpreter) Run(contract *Contract, input []byte, readOnly bool) (
defer func() {
if err != nil {
if !logged {
in.cfg.Tracer.CaptureState(in.evm, pcCopy, op, gasCopy, cost, callContext, in.returnData, in.evm.depth, err)
in.cfg.Tracer.CaptureState(pcCopy, op, gasCopy, cost, callContext, in.returnData, in.evm.depth, err)
} else {
in.cfg.Tracer.CaptureFault(in.evm, pcCopy, op, gasCopy, cost, callContext, in.evm.depth, err)
in.cfg.Tracer.CaptureFault(pcCopy, op, gasCopy, cost, callContext, in.evm.depth, err)
}
}
}()
......@@ -253,7 +253,7 @@ func (in *EVMInterpreter) Run(contract *Contract, input []byte, readOnly bool) (
}
if in.cfg.Debug {
in.cfg.Tracer.CaptureState(in.evm, pc, op, gasCopy, cost, callContext, in.returnData, in.evm.depth, err)
in.cfg.Tracer.CaptureState(pc, op, gasCopy, cost, callContext, in.returnData, in.evm.depth, err)
logged = true
}
......
core/vm/logger.go
View file @ 6b9c77f0
......@@ -105,10 +105,10 @@ func (s *StructLog) ErrorString() string {
// if you need to retain them beyond the current call.
type EVMLogger interface {
CaptureStart(env *EVM, from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int)
CaptureState(env *EVM, pc uint64, op OpCode, gas, cost uint64, scope *ScopeContext, rData []byte, depth int, err error)
CaptureState(pc uint64, op OpCode, gas, cost uint64, scope *ScopeContext, rData []byte, depth int, err error)
CaptureEnter(typ OpCode, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int)
CaptureExit(output []byte, gasUsed uint64, err error)
CaptureFault(env *EVM, pc uint64, op OpCode, gas, cost uint64, scope *ScopeContext, depth int, err error)
CaptureFault(pc uint64, op OpCode, gas, cost uint64, scope *ScopeContext, depth int, err error)
CaptureEnd(output []byte, gasUsed uint64, t time.Duration, err error)
}
......@@ -119,6 +119,7 @@ type EVMLogger interface {
// contract their storage.
type StructLogger struct {
cfg LogConfig
env *EVM
storage map[common.Address]Storage
logs []StructLog
......@@ -147,12 +148,13 @@ func (l *StructLogger) Reset() {
// CaptureStart implements the EVMLogger interface to initialize the tracing operation.
func (l *StructLogger) CaptureStart(env *EVM, from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int) {
l.env = env
}
// CaptureState logs a new structured log message and pushes it out to the environment
//
// CaptureState also tracks SLOAD/SSTORE ops to track storage change.
func (l *StructLogger) CaptureState(env *EVM, pc uint64, op OpCode, gas, cost uint64, scope *ScopeContext, rData []byte, depth int, err error) {
func (l *StructLogger) CaptureState(pc uint64, op OpCode, gas, cost uint64, scope *ScopeContext, rData []byte, depth int, err error) {
memory := scope.Memory
stack := scope.Stack
contract := scope.Contract
......@@ -186,7 +188,7 @@ func (l *StructLogger) CaptureState(env *EVM, pc uint64, op OpCode, gas, cost ui
if op == SLOAD && stack.len() >= 1 {
var (
address = common.Hash(stack.data[stack.len()-1].Bytes32())
value = env.StateDB.GetState(contract.Address(), address)
value = l.env.StateDB.GetState(contract.Address(), address)
)
l.storage[contract.Address()][address] = value
storage = l.storage[contract.Address()].Copy()
......@@ -206,13 +208,13 @@ func (l *StructLogger) CaptureState(env *EVM, pc uint64, op OpCode, gas, cost ui
copy(rdata, rData)
}
// create a new snapshot of the EVM.
log := StructLog{pc, op, gas, cost, mem, memory.Len(), stck, rdata, storage, depth, env.StateDB.GetRefund(), err}
log := StructLog{pc, op, gas, cost, mem, memory.Len(), stck, rdata, storage, depth, l.env.StateDB.GetRefund(), err}
l.logs = append(l.logs, log)
}
// CaptureFault implements the EVMLogger interface to trace an execution fault
// while running an opcode.
func (l *StructLogger) CaptureFault(env *EVM, pc uint64, op OpCode, gas, cost uint64, scope *ScopeContext, depth int, err error) {
func (l *StructLogger) CaptureFault(pc uint64, op OpCode, gas, cost uint64, scope *ScopeContext, depth int, err error) {
}
// CaptureEnd is called after the call finishes to finalize the tracing.
......@@ -291,12 +293,13 @@ func WriteLogs(writer io.Writer, logs []*types.Log) {
type mdLogger struct {
out io.Writer
cfg *LogConfig
env *EVM
}
// NewMarkdownLogger creates a logger which outputs information in a format adapted
// for human readability, and is also a valid markdown table
func NewMarkdownLogger(cfg *LogConfig, writer io.Writer) *mdLogger {
l := &mdLogger{writer, cfg}
l := &mdLogger{out: writer, cfg: cfg}
if l.cfg == nil {
l.cfg = &LogConfig{}
}
......@@ -304,6 +307,7 @@ func NewMarkdownLogger(cfg *LogConfig, writer io.Writer) *mdLogger {
}
func (t *mdLogger) CaptureStart(env *EVM, from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int) {
t.env = env
if !create {
fmt.Fprintf(t.out, "From: `%v`\nTo: `%v`\nData: `0x%x`\nGas: `%d`\nValue `%v` wei\n",
from.String(), to.String(),
......@@ -321,7 +325,7 @@ func (t *mdLogger) CaptureStart(env *EVM, from common.Address, to common.Address
}
// CaptureState also tracks SLOAD/SSTORE ops to track storage change.
func (t *mdLogger) CaptureState(env *EVM, pc uint64, op OpCode, gas, cost uint64, scope *ScopeContext, rData []byte, depth int, err error) {
func (t *mdLogger) CaptureState(pc uint64, op OpCode, gas, cost uint64, scope *ScopeContext, rData []byte, depth int, err error) {
stack := scope.Stack
fmt.Fprintf(t.out, "| %4d | %10v | %3d |", pc, op, cost)
......@@ -334,14 +338,14 @@ func (t *mdLogger) CaptureState(env *EVM, pc uint64, op OpCode, gas, cost uint64
b := fmt.Sprintf("[%v]", strings.Join(a, ","))
fmt.Fprintf(t.out, "%10v |", b)
}
fmt.Fprintf(t.out, "%10v |", env.StateDB.GetRefund())
fmt.Fprintf(t.out, "%10v |", t.env.StateDB.GetRefund())
fmt.Fprintln(t.out, "")
if err != nil {
fmt.Fprintf(t.out, "Error: %v\n", err)
}
}
func (t *mdLogger) CaptureFault(env *EVM, pc uint64, op OpCode, gas, cost uint64, scope *ScopeContext, depth int, err error) {
func (t *mdLogger) CaptureFault(pc uint64, op OpCode, gas, cost uint64, scope *ScopeContext, depth int, err error) {
fmt.Fprintf(t.out, "\nError: at pc=%d, op=%v: %v\n", pc, op, err)
}
......
core/vm/logger_json.go
View file @ 6b9c77f0
......@@ -29,12 +29,13 @@ import (
type JSONLogger struct {
encoder *json.Encoder
cfg *LogConfig
env *EVM
}
// NewJSONLogger creates a new EVM tracer that prints execution steps as JSON objects
// into the provided stream.
func NewJSONLogger(cfg *LogConfig, writer io.Writer) *JSONLogger {
l := &JSONLogger{json.NewEncoder(writer), cfg}
l := &JSONLogger{encoder: json.NewEncoder(writer), cfg: cfg}
if l.cfg == nil {
l.cfg = &LogConfig{}
}
......@@ -42,12 +43,13 @@ func NewJSONLogger(cfg *LogConfig, writer io.Writer) *JSONLogger {
}
func (l *JSONLogger) CaptureStart(env *EVM, from, to common.Address, create bool, input []byte, gas uint64, value *big.Int) {
l.env = env
}
func (l *JSONLogger) CaptureFault(*EVM, uint64, OpCode, uint64, uint64, *ScopeContext, int, error) {}
func (l *JSONLogger) CaptureFault(uint64, OpCode, uint64, uint64, *ScopeContext, int, error) {}
// CaptureState outputs state information on the logger.
func (l *JSONLogger) CaptureState(env *EVM, pc uint64, op OpCode, gas, cost uint64, scope *ScopeContext, rData []byte, depth int, err error) {
func (l *JSONLogger) CaptureState(pc uint64, op OpCode, gas, cost uint64, scope *ScopeContext, rData []byte, depth int, err error) {
memory := scope.Memory
stack := scope.Stack
......@@ -58,7 +60,7 @@ func (l *JSONLogger) CaptureState(env *EVM, pc uint64, op OpCode, gas, cost uint
GasCost: cost,
MemorySize: memory.Len(),
Depth: depth,
RefundCounter: env.StateDB.GetRefund(),
RefundCounter: l.env.StateDB.GetRefund(),
Err: err,
}
if l.cfg.EnableMemory {
......
core/vm/logger_test.go
View file @ 6b9c77f0
......@@ -62,7 +62,8 @@ func TestStoreCapture(t *testing.T) {
scope.Stack.push(uint256.NewInt(1))
scope.Stack.push(new(uint256.Int))
var index common.Hash
logger.CaptureState(env, 0, SSTORE, 0, 0, scope, nil, 0, nil)
logger.CaptureStart(env, common.Address{}, contract.Address(), false, nil, 0, nil)
logger.CaptureState(0, SSTORE, 0, 0, scope, nil, 0, nil)
if len(logger.storage[contract.Address()]) == 0 {
t.Fatalf("expected exactly 1 changed value on address %x, got %d", contract.Address(),
len(logger.storage[contract.Address()]))
......
core/vm/runtime/runtime_test.go
View file @ 6b9c77f0
......@@ -35,6 +35,9 @@ import (
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/eth/tracers"
"github.com/ethereum/go-ethereum/params"
// force-load js tracers to trigger registration
_ "github.com/ethereum/go-ethereum/eth/tracers/js"
)
func TestDefaults(t *testing.T) {
......@@ -330,12 +333,12 @@ type stepCounter struct {
func (s *stepCounter) CaptureStart(env *vm.EVM, from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int) {
}
func (s *stepCounter) CaptureFault(env *vm.EVM, pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, depth int, err error) {
func (s *stepCounter) CaptureFault(pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, depth int, err error) {
}
func (s *stepCounter) CaptureEnd(output []byte, gasUsed uint64, t time.Duration, err error) {}
func (s *stepCounter) CaptureState(env *vm.EVM, pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, rData []byte, depth int, err error) {
func (s *stepCounter) CaptureState(pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, rData []byte, depth int, err error) {
s.steps++
// Enable this for more output
//s.inner.CaptureState(env, pc, op, gas, cost, memory, stack, rStack, contract, depth, err)
......@@ -511,7 +514,7 @@ func BenchmarkSimpleLoop(b *testing.B) {
// TestEip2929Cases contains various testcases that are used for
// EIP-2929 about gas repricings
func TestEip2929Cases(t *testing.T) {
t.Skip("Test only useful for generating documentation")
id := 1
prettyPrint := func(comment string, code []byte) {
......
eth/tracers/api_test.go
View file @ 6b9c77f0
......@@ -306,147 +306,6 @@ func TestTraceCall(t *testing.T) {
}
}
func TestOverriddenTraceCall(t *testing.T) {
t.Parallel()
// Initialize test accounts
accounts := newAccounts(3)
genesis := &core.Genesis{Alloc: core.GenesisAlloc{
accounts[0].addr: {Balance: big.NewInt(params.Ether)},
accounts[1].addr: {Balance: big.NewInt(params.Ether)},
accounts[2].addr: {Balance: big.NewInt(params.Ether)},
}}
genBlocks := 10
signer := types.HomesteadSigner{}
api := NewAPI(newTestBackend(t, genBlocks, genesis, func(i int, b *core.BlockGen) {
// Transfer from account[0] to account[1]
// value: 1000 wei
// fee: 0 wei
tx, _ := types.SignTx(types.NewTransaction(uint64(i), accounts[1].addr, big.NewInt(1000), params.TxGas, b.BaseFee(), nil), signer, accounts[0].key)
b.AddTx(tx)
}))
randomAccounts, tracer := newAccounts(3), "callTracerJs"
var testSuite = []struct {
blockNumber rpc.BlockNumber
call ethapi.TransactionArgs
config *TraceCallConfig
expectErr error
expect *callTrace
}{
// Succcessful call with state overriding
{
blockNumber: rpc.PendingBlockNumber,
call: ethapi.TransactionArgs{
From: &randomAccounts[0].addr,
To: &randomAccounts[1].addr,
Value: (*hexutil.Big)(big.NewInt(1000)),
},
config: &TraceCallConfig{
Tracer: &tracer,
StateOverrides: &ethapi.StateOverride{
randomAccounts[0].addr: ethapi.OverrideAccount{Balance: newRPCBalance(new(big.Int).Mul(big.NewInt(1), big.NewInt(params.Ether)))},
},
},
expectErr: nil,
expect: &callTrace{
Type: "CALL",
From: randomAccounts[0].addr,
To: randomAccounts[1].addr,
Gas: newRPCUint64(24979000),
GasUsed: newRPCUint64(0),
Value: (*hexutil.Big)(big.NewInt(1000)),
},
},
// Invalid call without state overriding
{
blockNumber: rpc.PendingBlockNumber,
call: ethapi.TransactionArgs{
From: &randomAccounts[0].addr,
To: &randomAccounts[1].addr,
Value: (*hexutil.Big)(big.NewInt(1000)),
},
config: &TraceCallConfig{
Tracer: &tracer,
},
expectErr: core.ErrInsufficientFunds,
expect: nil,
},
// Successful simple contract call
//
// // SPDX-License-Identifier: GPL-3.0
//
// pragma solidity >=0.7.0 <0.8.0;
//
// /**
// * @title Storage
// * @dev Store & retrieve value in a variable
// */
// contract Storage {
// uint256 public number;
// constructor() {
// number = block.number;
// }
// }
{
blockNumber: rpc.PendingBlockNumber,
call: ethapi.TransactionArgs{
From: &randomAccounts[0].addr,
To: &randomAccounts[2].addr,
Data: newRPCBytes(common.Hex2Bytes("8381f58a")), // call number()
},
config: &TraceCallConfig{
Tracer: &tracer,
StateOverrides: &ethapi.StateOverride{
randomAccounts[2].addr: ethapi.OverrideAccount{
Code: newRPCBytes(common.Hex2Bytes("6080604052348015600f57600080fd5b506004361060285760003560e01c80638381f58a14602d575b600080fd5b60336049565b6040518082815260200191505060405180910390f35b6000548156fea2646970667358221220eab35ffa6ab2adfe380772a48b8ba78e82a1b820a18fcb6f59aa4efb20a5f60064736f6c63430007040033")),
StateDiff: newStates([]common.Hash{{}}, []common.Hash{common.BigToHash(big.NewInt(123))}),
},
},
},
expectErr: nil,
expect: &callTrace{
Type: "CALL",
From: randomAccounts[0].addr,
To: randomAccounts[2].addr,
Input: hexutil.Bytes(common.Hex2Bytes("8381f58a")),
Output: hexutil.Bytes(common.BigToHash(big.NewInt(123)).Bytes()),
Gas: newRPCUint64(24978936),
GasUsed: newRPCUint64(2283),
Value: (*hexutil.Big)(big.NewInt(0)),
},
},
}
for i, testspec := range testSuite {
result, err := api.TraceCall(context.Background(), testspec.call, rpc.BlockNumberOrHash{BlockNumber: &testspec.blockNumber}, testspec.config)
if testspec.expectErr != nil {
if err == nil {
t.Errorf("test %d: want error %v, have nothing", i, testspec.expectErr)
continue
}
if !errors.Is(err, testspec.expectErr) {
t.Errorf("test %d: error mismatch, want %v, have %v", i, testspec.expectErr, err)
}
} else {
if err != nil {
t.Errorf("test %d: want no error, have %v", i, err)
continue
}
ret := new(callTrace)
if err := json.Unmarshal(result.(json.RawMessage), ret); err != nil {
t.Fatalf("test %d: failed to unmarshal trace result: %v", i, err)
}
if !jsonEqual(ret, testspec.expect) {
// uncomment this for easier debugging
//have, _ := json.MarshalIndent(ret, "", " ")
//want, _ := json.MarshalIndent(testspec.expect, "", " ")
//t.Fatalf("trace mismatch: \nhave %+v\nwant %+v", string(have), string(want))
t.Fatalf("trace mismatch: \nhave %+v\nwant %+v", ret, testspec.expect)
}
}
}
}
func TestTraceTransaction(t *testing.T) {
t.Parallel()
......@@ -503,90 +362,177 @@ func TestTraceBlock(t *testing.T) {
var testSuite = []struct {
blockNumber rpc.BlockNumber
config *TraceConfig
expect interface{}
want string
expectErr error
}{
// Trace genesis block, expect error
{
blockNumber: rpc.BlockNumber(0),
config: nil,
expect: nil,
expectErr: errors.New("genesis is not traceable"),
},
// Trace head block
{
blockNumber: rpc.BlockNumber(genBlocks),
config: nil,
expectErr: nil,
expect: []*txTraceResult{
{
Result: &ethapi.ExecutionResult{
Gas: params.TxGas,
Failed: false,
ReturnValue: "",
StructLogs: []ethapi.StructLogRes{},
},
},
},
want: `[{"result":{"gas":21000,"failed":false,"returnValue":"","structLogs":[]}}]`,
},
// Trace non-existent block
{
blockNumber: rpc.BlockNumber(genBlocks + 1),
config: nil,
expectErr: fmt.Errorf("block #%d not found", genBlocks+1),
expect: nil,
},
// Trace latest block
{
blockNumber: rpc.LatestBlockNumber,
config: nil,
expectErr: nil,
expect: []*txTraceResult{
want: `[{"result":{"gas":21000,"failed":false,"returnValue":"","structLogs":[]}}]`,
},
// Trace pending block
{
Result: &ethapi.ExecutionResult{
Gas: params.TxGas,
Failed: false,
ReturnValue: "",
StructLogs: []ethapi.StructLogRes{},
blockNumber: rpc.PendingBlockNumber,
want: `[{"result":{"gas":21000,"failed":false,"returnValue":"","structLogs":[]}}]`,
},
}
for i, tc := range testSuite {
result, err := api.TraceBlockByNumber(context.Background(), tc.blockNumber, tc.config)
if tc.expectErr != nil {
if err == nil {
t.Errorf("test %d, want error %v", i, tc.expectErr)
continue
}
if !reflect.DeepEqual(err, tc.expectErr) {
t.Errorf("test %d: error mismatch, want %v, get %v", i, tc.expectErr, err)
}
continue
}
if err != nil {
t.Errorf("test %d, want no error, have %v", i, err)
continue
}
have, _ := json.Marshal(result)
want := tc.want
if string(have) != want {
t.Errorf("test %d, result mismatch, have\n%v\n, want\n%v\n", i, string(have), want)
}
}
}
func TestTracingWithOverrides(t *testing.T) {
t.Parallel()
// Initialize test accounts
accounts := newAccounts(3)
genesis := &core.Genesis{Alloc: core.GenesisAlloc{
accounts[0].addr: {Balance: big.NewInt(params.Ether)},
accounts[1].addr: {Balance: big.NewInt(params.Ether)},
accounts[2].addr: {Balance: big.NewInt(params.Ether)},
}}
genBlocks := 10
signer := types.HomesteadSigner{}
api := NewAPI(newTestBackend(t, genBlocks, genesis, func(i int, b *core.BlockGen) {
// Transfer from account[0] to account[1]
// value: 1000 wei
// fee: 0 wei
tx, _ := types.SignTx(types.NewTransaction(uint64(i), accounts[1].addr, big.NewInt(1000), params.TxGas, b.BaseFee(), nil), signer, accounts[0].key)
b.AddTx(tx)
}))
randomAccounts := newAccounts(3)
type res struct {
Gas int
Failed bool
returnValue string
}
var testSuite = []struct {
blockNumber rpc.BlockNumber
call ethapi.TransactionArgs
config *TraceCallConfig
expectErr error
want string
}{
// Call which can only succeed if state is state overridden
{
blockNumber: rpc.PendingBlockNumber,
call: ethapi.TransactionArgs{
From: &randomAccounts[0].addr,
To: &randomAccounts[1].addr,
Value: (*hexutil.Big)(big.NewInt(1000)),
},
config: &TraceCallConfig{
StateOverrides: &ethapi.StateOverride{
randomAccounts[0].addr: ethapi.OverrideAccount{Balance: newRPCBalance(new(big.Int).Mul(big.NewInt(1), big.NewInt(params.Ether)))},
},
},
// Trace pending block
want: `{"gas":21000,"failed":false,"returnValue":""}`,
},
// Invalid call without state overriding
{
blockNumber: rpc.PendingBlockNumber,
config: nil,
expectErr: nil,
expect: []*txTraceResult{
call: ethapi.TransactionArgs{
From: &randomAccounts[0].addr,
To: &randomAccounts[1].addr,
Value: (*hexutil.Big)(big.NewInt(1000)),
},
config: &TraceCallConfig{},
expectErr: core.ErrInsufficientFunds,
},
// Successful simple contract call
//
// // SPDX-License-Identifier: GPL-3.0
//
// pragma solidity >=0.7.0 <0.8.0;
//
// /**
// * @title Storage
// * @dev Store & retrieve value in a variable
// */
// contract Storage {
// uint256 public number;
// constructor() {
// number = block.number;
// }
// }
{
Result: &ethapi.ExecutionResult{
Gas: params.TxGas,
Failed: false,
ReturnValue: "",
StructLogs: []ethapi.StructLogRes{},
blockNumber: rpc.PendingBlockNumber,
call: ethapi.TransactionArgs{
From: &randomAccounts[0].addr,
To: &randomAccounts[2].addr,
Data: newRPCBytes(common.Hex2Bytes("8381f58a")), // call number()
},
config: &TraceCallConfig{
//Tracer: &tracer,
StateOverrides: &ethapi.StateOverride{
randomAccounts[2].addr: ethapi.OverrideAccount{
Code: newRPCBytes(common.Hex2Bytes("6080604052348015600f57600080fd5b506004361060285760003560e01c80638381f58a14602d575b600080fd5b60336049565b6040518082815260200191505060405180910390f35b6000548156fea2646970667358221220eab35ffa6ab2adfe380772a48b8ba78e82a1b820a18fcb6f59aa4efb20a5f60064736f6c63430007040033")),
StateDiff: newStates([]common.Hash{{}}, []common.Hash{common.BigToHash(big.NewInt(123))}),
},
},
},
want: `{"gas":23347,"failed":false,"returnValue":"000000000000000000000000000000000000000000000000000000000000007b"}`,
},
}
for _, testspec := range testSuite {
result, err := api.TraceBlockByNumber(context.Background(), testspec.blockNumber, testspec.config)
if testspec.expectErr != nil {
for i, tc := range testSuite {
result, err := api.TraceCall(context.Background(), tc.call, rpc.BlockNumberOrHash{BlockNumber: &tc.blockNumber}, tc.config)
if tc.expectErr != nil {
if err == nil {
t.Errorf("Expect error %v, get nothing", testspec.expectErr)
t.Errorf("test %d: want error %v, have nothing", i, tc.expectErr)
continue
}
if !reflect.DeepEqual(err, testspec.expectErr) {
t.Errorf("Error mismatch, want %v, get %v", testspec.expectErr, err)
if !errors.Is(err, tc.expectErr) {
t.Errorf("test %d: error mismatch, want %v, have %v", i, tc.expectErr, err)
}
} else {
if err != nil {
t.Errorf("Expect no error, get %v", err)
continue
}
if !reflect.DeepEqual(result, testspec.expect) {
t.Errorf("Result mismatch, want %v, get %v", testspec.expect, result)
if err != nil {
t.Errorf("test %d: want no error, have %v", i, err)
continue
}
// Turn result into res-struct
var (
have res
want res
)
resBytes, _ := json.Marshal(result)
json.Unmarshal(resBytes, &have)
json.Unmarshal([]byte(tc.want), &want)
if !reflect.DeepEqual(have, want) {
t.Errorf("test %d, result mismatch, have\n%v\n, want\n%v\n", i, string(resBytes), want)
}
}
}
......@@ -617,11 +563,6 @@ func newRPCBalance(balance *big.Int) **hexutil.Big {
return &rpcBalance
}
func newRPCUint64(number uint64) *hexutil.Uint64 {
rpcUint64 := hexutil.Uint64(number)
return &rpcUint64
}
func newRPCBytes(bytes []byte) *hexutil.Bytes {
rpcBytes := hexutil.Bytes(bytes)
return &rpcBytes
......
eth/tracers/testing/calltrace_test.go → eth/tracers/internal/tracetest/calltrace_test.go
View file @ 6b9c77f0
package testing
// Copyright 2021 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 tracetest
import (
"encoding/json"
......@@ -17,14 +33,67 @@ import (
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/eth/tracers"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/tests"
// Force-load the native, to trigger registration
// Force-load native and js pacakges, to trigger registration
_ "github.com/ethereum/go-ethereum/eth/tracers/js"
_ "github.com/ethereum/go-ethereum/eth/tracers/native"
)
// To generate a new callTracer test, copy paste the makeTest method below into
// a Geth console and call it with a transaction hash you which to export.
/*
// makeTest generates a callTracer test by running a prestate reassembled and a
// call trace run, assembling all the gathered information into a test case.
var makeTest = function(tx, rewind) {
// Generate the genesis block from the block, transaction and prestate data
var block = eth.getBlock(eth.getTransaction(tx).blockHash);
var genesis = eth.getBlock(block.parentHash);
delete genesis.gasUsed;
delete genesis.logsBloom;
delete genesis.parentHash;
delete genesis.receiptsRoot;
delete genesis.sha3Uncles;
delete genesis.size;
delete genesis.transactions;
delete genesis.transactionsRoot;
delete genesis.uncles;
genesis.gasLimit = genesis.gasLimit.toString();
genesis.number = genesis.number.toString();
genesis.timestamp = genesis.timestamp.toString();
genesis.alloc = debug.traceTransaction(tx, {tracer: "prestateTracer", rewind: rewind});
for (var key in genesis.alloc) {
genesis.alloc[key].nonce = genesis.alloc[key].nonce.toString();
}
genesis.config = admin.nodeInfo.protocols.eth.config;
// Generate the call trace and produce the test input
var result = debug.traceTransaction(tx, {tracer: "callTracer", rewind: rewind});
delete result.time;
console.log(JSON.stringify({
genesis: genesis,
context: {
number: block.number.toString(),
difficulty: block.difficulty,
timestamp: block.timestamp.toString(),
gasLimit: block.gasLimit.toString(),
miner: block.miner,
},
input: eth.getRawTransaction(tx),
result: result,
}, null, 2));
}
*/
type callContext struct {
Number math.HexOrDecimal64 `json:"number"`
Difficulty *math.HexOrDecimal256 `json:"difficulty"`
......@@ -70,7 +139,7 @@ func TestCallTracerNative(t *testing.T) {
}
func testCallTracer(tracerName string, dirPath string, t *testing.T) {
files, err := ioutil.ReadDir(filepath.Join("..", "testdata", dirPath))
files, err := ioutil.ReadDir(filepath.Join("testdata", dirPath))
if err != nil {
t.Fatalf("failed to retrieve tracer test suite: %v", err)
}
......@@ -87,7 +156,7 @@ func testCallTracer(tracerName string, dirPath string, t *testing.T) {
tx = new(types.Transaction)
)
// Call tracer test found, read if from disk
if blob, err := ioutil.ReadFile(filepath.Join("..", "testdata", dirPath, file.Name())); err != nil {
if blob, err := ioutil.ReadFile(filepath.Join("testdata", dirPath, file.Name())); err != nil {
t.Fatalf("failed to read testcase: %v", err)
} else if err := json.Unmarshal(blob, test); err != nil {
t.Fatalf("failed to parse testcase: %v", err)
......@@ -175,7 +244,7 @@ func camel(str string) string {
return strings.Join(pieces, "")
}
func BenchmarkTracers(b *testing.B) {
files, err := ioutil.ReadDir(filepath.Join("..", "testdata", "call_tracer"))
files, err := ioutil.ReadDir(filepath.Join("testdata", "call_tracer"))
if err != nil {
b.Fatalf("failed to retrieve tracer test suite: %v", err)
}
......@@ -185,7 +254,7 @@ func BenchmarkTracers(b *testing.B) {
}
file := file // capture range variable
b.Run(camel(strings.TrimSuffix(file.Name(), ".json")), func(b *testing.B) {
blob, err := ioutil.ReadFile(filepath.Join("..", "testdata", "call_tracer", file.Name()))
blob, err := ioutil.ReadFile(filepath.Join("testdata", "call_tracer", file.Name()))
if err != nil {
b.Fatalf("failed to read testcase: %v", err)
}
......@@ -244,3 +313,82 @@ func benchTracer(tracerName string, test *callTracerTest, b *testing.B) {
statedb.RevertToSnapshot(snap)
}
}
// TestZeroValueToNotExitCall tests the calltracer(s) on the following:
// Tx to A, A calls B with zero value. B does not already exist.
// Expected: that enter/exit is invoked and the inner call is shown in the result
func TestZeroValueToNotExitCall(t *testing.T) {
var to = common.HexToAddress("0x00000000000000000000000000000000deadbeef")
privkey, err := crypto.HexToECDSA("0000000000000000deadbeef00000000000000000000000000000000deadbeef")
if err != nil {
t.Fatalf("err %v", err)
}
signer := types.NewEIP155Signer(big.NewInt(1))
tx, err := types.SignNewTx(privkey, signer, &types.LegacyTx{
GasPrice: big.NewInt(0),
Gas: 50000,
To: &to,
})
if err != nil {
t.Fatalf("err %v", err)
}
origin, _ := signer.Sender(tx)
txContext := vm.TxContext{
Origin: origin,
GasPrice: big.NewInt(1),
}
context := vm.BlockContext{
CanTransfer: core.CanTransfer,
Transfer: core.Transfer,
Coinbase: common.Address{},
BlockNumber: new(big.Int).SetUint64(8000000),
Time: new(big.Int).SetUint64(5),
Difficulty: big.NewInt(0x30000),
GasLimit: uint64(6000000),
}
var code = []byte{
byte(vm.PUSH1), 0x0, byte(vm.DUP1), byte(vm.DUP1), byte(vm.DUP1), // in and outs zero
byte(vm.DUP1), byte(vm.PUSH1), 0xff, byte(vm.GAS), // value=0,address=0xff, gas=GAS
byte(vm.CALL),
}
var alloc = core.GenesisAlloc{
to: core.GenesisAccount{
Nonce: 1,
Code: code,
},
origin: core.GenesisAccount{
Nonce: 0,
Balance: big.NewInt(500000000000000),
},
}
_, statedb := tests.MakePreState(rawdb.NewMemoryDatabase(), alloc, false)
// Create the tracer, the EVM environment and run it
tracer, err := tracers.New("callTracer", nil)
if err != nil {
t.Fatalf("failed to create call tracer: %v", err)
}
evm := vm.NewEVM(context, txContext, statedb, params.MainnetChainConfig, vm.Config{Debug: true, Tracer: tracer})
msg, err := tx.AsMessage(signer, nil)
if err != nil {
t.Fatalf("failed to prepare transaction for tracing: %v", err)
}
st := core.NewStateTransition(evm, msg, new(core.GasPool).AddGas(tx.Gas()))
if _, err = st.TransitionDb(); err != nil {
t.Fatalf("failed to execute transaction: %v", err)
}
// Retrieve the trace result and compare against the etalon
res, err := tracer.GetResult()
if err != nil {
t.Fatalf("failed to retrieve trace result: %v", err)
}
have := new(callTrace)
if err := json.Unmarshal(res, have); err != nil {
t.Fatalf("failed to unmarshal trace result: %v", err)
}
wantStr := `{"type":"CALL","from":"0x682a80a6f560eec50d54e63cbeda1c324c5f8d1b","to":"0x00000000000000000000000000000000deadbeef","value":"0x0","gas":"0x7148","gasUsed":"0x2d0","input":"0x","output":"0x","calls":[{"type":"CALL","from":"0x00000000000000000000000000000000deadbeef","to":"0x00000000000000000000000000000000000000ff","value":"0x0","gas":"0x6cbf","gasUsed":"0x0","input":"0x","output":"0x"}]}`
want := new(callTrace)
json.Unmarshal([]byte(wantStr), want)
if !jsonEqual(have, want) {
t.Error("have != want")
}
}
eth/tracers/tracer.go → eth/tracers/js/bigint.go
View file @ 6b9c77f0
// Copyright 2017 The go-ethereum Authors
// Copyright 2021 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
......@@ -14,845 +14,7 @@
// 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 tracers
import (
"encoding/json"
"errors"
"fmt"
"math/big"
"sync/atomic"
"time"
"unsafe"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/log"
"gopkg.in/olebedev/go-duktape.v3"
)
package js
// bigIntegerJS is the minified version of https://github.com/peterolson/BigInteger.js.
const bigIntegerJS = `var bigInt=function(undefined){"use strict";var BASE=1e7,LOG_BASE=7,MAX_INT=9007199254740992,MAX_INT_ARR=smallToArray(MAX_INT),LOG_MAX_INT=Math.log(MAX_INT);function Integer(v,radix){if(typeof v==="undefined")return Integer[0];if(typeof radix!=="undefined")return+radix===10?parseValue(v):parseBase(v,radix);return parseValue(v)}function BigInteger(value,sign){this.value=value;this.sign=sign;this.isSmall=false}BigInteger.prototype=Object.create(Integer.prototype);function SmallInteger(value){this.value=value;this.sign=value<0;this.isSmall=true}SmallInteger.prototype=Object.create(Integer.prototype);function isPrecise(n){return-MAX_INT<n&&n<MAX_INT}function smallToArray(n){if(n<1e7)return[n];if(n<1e14)return[n%1e7,Math.floor(n/1e7)];return[n%1e7,Math.floor(n/1e7)%1e7,Math.floor(n/1e14)]}function arrayToSmall(arr){trim(arr);var length=arr.length;if(length<4&&compareAbs(arr,MAX_INT_ARR)<0){switch(length){case 0:return 0;case 1:return arr[0];case 2:return arr[0]+arr[1]*BASE;default:return arr[0]+(arr[1]+arr[2]*BASE)*BASE}}return arr}function trim(v){var i=v.length;while(v[--i]===0);v.length=i+1}function createArray(length){var x=new Array(length);var i=-1;while(++i<length){x[i]=0}return x}function truncate(n){if(n>0)return Math.floor(n);return Math.ceil(n)}function add(a,b){var l_a=a.length,l_b=b.length,r=new Array(l_a),carry=0,base=BASE,sum,i;for(i=0;i<l_b;i++){sum=a[i]+b[i]+carry;carry=sum>=base?1:0;r[i]=sum-carry*base}while(i<l_a){sum=a[i]+carry;carry=sum===base?1:0;r[i++]=sum-carry*base}if(carry>0)r.push(carry);return r}function addAny(a,b){if(a.length>=b.length)return add(a,b);return add(b,a)}function addSmall(a,carry){var l=a.length,r=new Array(l),base=BASE,sum,i;for(i=0;i<l;i++){sum=a[i]-base+carry;carry=Math.floor(sum/base);r[i]=sum-carry*base;carry+=1}while(carry>0){r[i++]=carry%base;carry=Math.floor(carry/base)}return r}BigInteger.prototype.add=function(v){var n=parseValue(v);if(this.sign!==n.sign){return this.subtract(n.negate())}var a=this.value,b=n.value;if(n.isSmall){return new BigInteger(addSmall(a,Math.abs(b)),this.sign)}return new BigInteger(addAny(a,b),this.sign)};BigInteger.prototype.plus=BigInteger.prototype.add;SmallInteger.prototype.add=function(v){var n=parseValue(v);var a=this.value;if(a<0!==n.sign){return this.subtract(n.negate())}var b=n.value;if(n.isSmall){if(isPrecise(a+b))return new SmallInteger(a+b);b=smallToArray(Math.abs(b))}return new BigInteger(addSmall(b,Math.abs(a)),a<0)};SmallInteger.prototype.plus=SmallInteger.prototype.add;function subtract(a,b){var a_l=a.length,b_l=b.length,r=new Array(a_l),borrow=0,base=BASE,i,difference;for(i=0;i<b_l;i++){difference=a[i]-borrow-b[i];if(difference<0){difference+=base;borrow=1}else borrow=0;r[i]=difference}for(i=b_l;i<a_l;i++){difference=a[i]-borrow;if(difference<0)difference+=base;else{r[i++]=difference;break}r[i]=difference}for(;i<a_l;i++){r[i]=a[i]}trim(r);return r}function subtractAny(a,b,sign){var value;if(compareAbs(a,b)>=0){value=subtract(a,b)}else{value=subtract(b,a);sign=!sign}value=arrayToSmall(value);if(typeof value==="number"){if(sign)value=-value;return new SmallInteger(value)}return new BigInteger(value,sign)}function subtractSmall(a,b,sign){var l=a.length,r=new Array(l),carry=-b,base=BASE,i,difference;for(i=0;i<l;i++){difference=a[i]+carry;carry=Math.floor(difference/base);difference%=base;r[i]=difference<0?difference+base:difference}r=arrayToSmall(r);if(typeof r==="number"){if(sign)r=-r;return new SmallInteger(r)}return new BigInteger(r,sign)}BigInteger.prototype.subtract=function(v){var n=parseValue(v);if(this.sign!==n.sign){return this.add(n.negate())}var a=this.value,b=n.value;if(n.isSmall)return subtractSmall(a,Math.abs(b),this.sign);return subtractAny(a,b,this.sign)};BigInteger.prototype.minus=BigInteger.prototype.subtract;SmallInteger.prototype.subtract=function(v){var n=parseValue(v);var a=this.value;if(a<0!==n.sign){return this.add(n.negate())}var b=n.value;if(n.isSmall){return new SmallInteger(a-b)}return subtractSmall(b,Math.abs(a),a>=0)};SmallInteger.prototype.minus=SmallInteger.prototype.subtract;BigInteger.prototype.negate=function(){return new BigInteger(this.value,!this.sign)};SmallInteger.prototype.negate=function(){var sign=this.sign;var small=new SmallInteger(-this.value);small.sign=!sign;return small};BigInteger.prototype.abs=function(){return new BigInteger(this.value,false)};SmallInteger.prototype.abs=function(){return new SmallInteger(Math.abs(this.value))};function multiplyLong(a,b){var a_l=a.length,b_l=b.length,l=a_l+b_l,r=createArray(l),base=BASE,product,carry,i,a_i,b_j;for(i=0;i<a_l;++i){a_i=a[i];for(var j=0;j<b_l;++j){b_j=b[j];product=a_i*b_j+r[i+j];carry=Math.floor(product/base);r[i+j]=product-carry*base;r[i+j+1]+=carry}}trim(r);return r}function multiplySmall(a,b){var l=a.length,r=new Array(l),base=BASE,carry=0,product,i;for(i=0;i<l;i++){product=a[i]*b+carry;carry=Math.floor(product/base);r[i]=product-carry*base}while(carry>0){r[i++]=carry%base;carry=Math.floor(carry/base)}return r}function shiftLeft(x,n){var r=[];while(n-- >0)r.push(0);return r.concat(x)}function multiplyKaratsuba(x,y){var n=Math.max(x.length,y.length);if(n<=30)return multiplyLong(x,y);n=Math.ceil(n/2);var b=x.slice(n),a=x.slice(0,n),d=y.slice(n),c=y.slice(0,n);var ac=multiplyKaratsuba(a,c),bd=multiplyKaratsuba(b,d),abcd=multiplyKaratsuba(addAny(a,b),addAny(c,d));var product=addAny(addAny(ac,shiftLeft(subtract(subtract(abcd,ac),bd),n)),shiftLeft(bd,2*n));trim(product);return product}function useKaratsuba(l1,l2){return-.012*l1-.012*l2+15e-6*l1*l2>0}BigInteger.prototype.multiply=function(v){var n=parseValue(v),a=this.value,b=n.value,sign=this.sign!==n.sign,abs;if(n.isSmall){if(b===0)return Integer[0];if(b===1)return this;if(b===-1)return this.negate();abs=Math.abs(b);if(abs<BASE){return new BigInteger(multiplySmall(a,abs),sign)}b=smallToArray(abs)}if(useKaratsuba(a.length,b.length))return new BigInteger(multiplyKaratsuba(a,b),sign);return new BigInteger(multiplyLong(a,b),sign)};BigInteger.prototype.times=BigInteger.prototype.multiply;function multiplySmallAndArray(a,b,sign){if(a<BASE){return new BigInteger(multiplySmall(b,a),sign)}return new BigInteger(multiplyLong(b,smallToArray(a)),sign)}SmallInteger.prototype._multiplyBySmall=function(a){if(isPrecise(a.value*this.value)){return new SmallInteger(a.value*this.value)}return multiplySmallAndArray(Math.abs(a.value),smallToArray(Math.abs(this.value)),this.sign!==a.sign)};BigInteger.prototype._multiplyBySmall=function(a){if(a.value===0)return Integer[0];if(a.value===1)return this;if(a.value===-1)return this.negate();return multiplySmallAndArray(Math.abs(a.value),this.value,this.sign!==a.sign)};SmallInteger.prototype.multiply=function(v){return parseValue(v)._multiplyBySmall(this)};SmallInteger.prototype.times=SmallInteger.prototype.multiply;function square(a){var l=a.length,r=createArray(l+l),base=BASE,product,carry,i,a_i,a_j;for(i=0;i<l;i++){a_i=a[i];for(var j=0;j<l;j++){a_j=a[j];product=a_i*a_j+r[i+j];carry=Math.floor(product/base);r[i+j]=product-carry*base;r[i+j+1]+=carry}}trim(r);return r}BigInteger.prototype.square=function(){return new BigInteger(square(this.value),false)};SmallInteger.prototype.square=function(){var value=this.value*this.value;if(isPrecise(value))return new SmallInteger(value);return new BigInteger(square(smallToArray(Math.abs(this.value))),false)};function divMod1(a,b){var a_l=a.length,b_l=b.length,base=BASE,result=createArray(b.length),divisorMostSignificantDigit=b[b_l-1],lambda=Math.ceil(base/(2*divisorMostSignificantDigit)),remainder=multiplySmall(a,lambda),divisor=multiplySmall(b,lambda),quotientDigit,shift,carry,borrow,i,l,q;if(remainder.length<=a_l)remainder.push(0);divisor.push(0);divisorMostSignificantDigit=divisor[b_l-1];for(shift=a_l-b_l;shift>=0;shift--){quotientDigit=base-1;if(remainder[shift+b_l]!==divisorMostSignificantDigit){quotientDigit=Math.floor((remainder[shift+b_l]*base+remainder[shift+b_l-1])/divisorMostSignificantDigit)}carry=0;borrow=0;l=divisor.length;for(i=0;i<l;i++){carry+=quotientDigit*divisor[i];q=Math.floor(carry/base);borrow+=remainder[shift+i]-(carry-q*base);carry=q;if(borrow<0){remainder[shift+i]=borrow+base;borrow=-1}else{remainder[shift+i]=borrow;borrow=0}}while(borrow!==0){quotientDigit-=1;carry=0;for(i=0;i<l;i++){carry+=remainder[shift+i]-base+divisor[i];if(carry<0){remainder[shift+i]=carry+base;carry=0}else{remainder[shift+i]=carry;carry=1}}borrow+=carry}result[shift]=quotientDigit}remainder=divModSmall(remainder,lambda)[0];return[arrayToSmall(result),arrayToSmall(remainder)]}function divMod2(a,b){var a_l=a.length,b_l=b.length,result=[],part=[],base=BASE,guess,xlen,highx,highy,check;while(a_l){part.unshift(a[--a_l]);trim(part);if(compareAbs(part,b)<0){result.push(0);continue}xlen=part.length;highx=part[xlen-1]*base+part[xlen-2];highy=b[b_l-1]*base+b[b_l-2];if(xlen>b_l){highx=(highx+1)*base}guess=Math.ceil(highx/highy);do{check=multiplySmall(b,guess);if(compareAbs(check,part)<=0)break;guess--}while(guess);result.push(guess);part=subtract(part,check)}result.reverse();return[arrayToSmall(result),arrayToSmall(part)]}function divModSmall(value,lambda){var length=value.length,quotient=createArray(length),base=BASE,i,q,remainder,divisor;remainder=0;for(i=length-1;i>=0;--i){divisor=remainder*base+value[i];q=truncate(divisor/lambda);remainder=divisor-q*lambda;quotient[i]=q|0}return[quotient,remainder|0]}function divModAny(self,v){var value,n=parseValue(v);var a=self.value,b=n.value;var quotient;if(b===0)throw new Error("Cannot divide by zero");if(self.isSmall){if(n.isSmall){return[new SmallInteger(truncate(a/b)),new SmallInteger(a%b)]}return[Integer[0],self]}if(n.isSmall){if(b===1)return[self,Integer[0]];if(b==-1)return[self.negate(),Integer[0]];var abs=Math.abs(b);if(abs<BASE){value=divModSmall(a,abs);quotient=arrayToSmall(value[0]);var remainder=value[1];if(self.sign)remainder=-remainder;if(typeof quotient==="number"){if(self.sign!==n.sign)quotient=-quotient;return[new SmallInteger(quotient),new SmallInteger(remainder)]}return[new BigInteger(quotient,self.sign!==n.sign),new SmallInteger(remainder)]}b=smallToArray(abs)}var comparison=compareAbs(a,b);if(comparison===-1)return[Integer[0],self];if(comparison===0)return[Integer[self.sign===n.sign?1:-1],Integer[0]];if(a.length+b.length<=200)value=divMod1(a,b);else value=divMod2(a,b);quotient=value[0];var qSign=self.sign!==n.sign,mod=value[1],mSign=self.sign;if(typeof quotient==="number"){if(qSign)quotient=-quotient;quotient=new SmallInteger(quotient)}else quotient=new BigInteger(quotient,qSign);if(typeof mod==="number"){if(mSign)mod=-mod;mod=new SmallInteger(mod)}else mod=new BigInteger(mod,mSign);return[quotient,mod]}BigInteger.prototype.divmod=function(v){var result=divModAny(this,v);return{quotient:result[0],remainder:result[1]}};SmallInteger.prototype.divmod=BigInteger.prototype.divmod;BigInteger.prototype.divide=function(v){return divModAny(this,v)[0]};SmallInteger.prototype.over=SmallInteger.prototype.divide=BigInteger.prototype.over=BigInteger.prototype.divide;BigInteger.prototype.mod=function(v){return divModAny(this,v)[1]};SmallInteger.prototype.remainder=SmallInteger.prototype.mod=BigInteger.prototype.remainder=BigInteger.prototype.mod;BigInteger.prototype.pow=function(v){var n=parseValue(v),a=this.value,b=n.value,value,x,y;if(b===0)return Integer[1];if(a===0)return Integer[0];if(a===1)return Integer[1];if(a===-1)return n.isEven()?Integer[1]:Integer[-1];if(n.sign){return Integer[0]}if(!n.isSmall)throw new Error("The exponent "+n.toString()+" is too large.");if(this.isSmall){if(isPrecise(value=Math.pow(a,b)))return new SmallInteger(truncate(value))}x=this;y=Integer[1];while(true){if(b&1===1){y=y.times(x);--b}if(b===0)break;b/=2;x=x.square()}return y};SmallInteger.prototype.pow=BigInteger.prototype.pow;BigInteger.prototype.modPow=function(exp,mod){exp=parseValue(exp);mod=parseValue(mod);if(mod.isZero())throw new Error("Cannot take modPow with modulus 0");var r=Integer[1],base=this.mod(mod);while(exp.isPositive()){if(base.isZero())return Integer[0];if(exp.isOdd())r=r.multiply(base).mod(mod);exp=exp.divide(2);base=base.square().mod(mod)}return r};SmallInteger.prototype.modPow=BigInteger.prototype.modPow;function compareAbs(a,b){if(a.length!==b.length){return a.length>b.length?1:-1}for(var i=a.length-1;i>=0;i--){if(a[i]!==b[i])return a[i]>b[i]?1:-1}return 0}BigInteger.prototype.compareAbs=function(v){var n=parseValue(v),a=this.value,b=n.value;if(n.isSmall)return 1;return compareAbs(a,b)};SmallInteger.prototype.compareAbs=function(v){var n=parseValue(v),a=Math.abs(this.value),b=n.value;if(n.isSmall){b=Math.abs(b);return a===b?0:a>b?1:-1}return-1};BigInteger.prototype.compare=function(v){if(v===Infinity){return-1}if(v===-Infinity){return 1}var n=parseValue(v),a=this.value,b=n.value;if(this.sign!==n.sign){return n.sign?1:-1}if(n.isSmall){return this.sign?-1:1}return compareAbs(a,b)*(this.sign?-1:1)};BigInteger.prototype.compareTo=BigInteger.prototype.compare;SmallInteger.prototype.compare=function(v){if(v===Infinity){return-1}if(v===-Infinity){return 1}var n=parseValue(v),a=this.value,b=n.value;if(n.isSmall){return a==b?0:a>b?1:-1}if(a<0!==n.sign){return a<0?-1:1}return a<0?1:-1};SmallInteger.prototype.compareTo=SmallInteger.prototype.compare;BigInteger.prototype.equals=function(v){return this.compare(v)===0};SmallInteger.prototype.eq=SmallInteger.prototype.equals=BigInteger.prototype.eq=BigInteger.prototype.equals;BigInteger.prototype.notEquals=function(v){return this.compare(v)!==0};SmallInteger.prototype.neq=SmallInteger.prototype.notEquals=BigInteger.prototype.neq=BigInteger.prototype.notEquals;BigInteger.prototype.greater=function(v){return this.compare(v)>0};SmallInteger.prototype.gt=SmallInteger.prototype.greater=BigInteger.prototype.gt=BigInteger.prototype.greater;BigInteger.prototype.lesser=function(v){return this.compare(v)<0};SmallInteger.prototype.lt=SmallInteger.prototype.lesser=BigInteger.prototype.lt=BigInteger.prototype.lesser;BigInteger.prototype.greaterOrEquals=function(v){return this.compare(v)>=0};SmallInteger.prototype.geq=SmallInteger.prototype.greaterOrEquals=BigInteger.prototype.geq=BigInteger.prototype.greaterOrEquals;BigInteger.prototype.lesserOrEquals=function(v){return this.compare(v)<=0};SmallInteger.prototype.leq=SmallInteger.prototype.lesserOrEquals=BigInteger.prototype.leq=BigInteger.prototype.lesserOrEquals;BigInteger.prototype.isEven=function(){return(this.value[0]&1)===0};SmallInteger.prototype.isEven=function(){return(this.value&1)===0};BigInteger.prototype.isOdd=function(){return(this.value[0]&1)===1};SmallInteger.prototype.isOdd=function(){return(this.value&1)===1};BigInteger.prototype.isPositive=function(){return!this.sign};SmallInteger.prototype.isPositive=function(){return this.value>0};BigInteger.prototype.isNegative=function(){return this.sign};SmallInteger.prototype.isNegative=function(){return this.value<0};BigInteger.prototype.isUnit=function(){return false};SmallInteger.prototype.isUnit=function(){return Math.abs(this.value)===1};BigInteger.prototype.isZero=function(){return false};SmallInteger.prototype.isZero=function(){return this.value===0};BigInteger.prototype.isDivisibleBy=function(v){var n=parseValue(v);var value=n.value;if(value===0)return false;if(value===1)return true;if(value===2)return this.isEven();return this.mod(n).equals(Integer[0])};SmallInteger.prototype.isDivisibleBy=BigInteger.prototype.isDivisibleBy;function isBasicPrime(v){var n=v.abs();if(n.isUnit())return false;if(n.equals(2)||n.equals(3)||n.equals(5))return true;if(n.isEven()||n.isDivisibleBy(3)||n.isDivisibleBy(5))return false;if(n.lesser(25))return true}BigInteger.prototype.isPrime=function(){var isPrime=isBasicPrime(this);if(isPrime!==undefined)return isPrime;var n=this.abs(),nPrev=n.prev();var a=[2,3,5,7,11,13,17,19],b=nPrev,d,t,i,x;while(b.isEven())b=b.divide(2);for(i=0;i<a.length;i++){x=bigInt(a[i]).modPow(b,n);if(x.equals(Integer[1])||x.equals(nPrev))continue;for(t=true,d=b;t&&d.lesser(nPrev);d=d.multiply(2)){x=x.square().mod(n);if(x.equals(nPrev))t=false}if(t)return false}return true};SmallInteger.prototype.isPrime=BigInteger.prototype.isPrime;BigInteger.prototype.isProbablePrime=function(iterations){var isPrime=isBasicPrime(this);if(isPrime!==undefined)return isPrime;var n=this.abs();var t=iterations===undefined?5:iterations;for(var i=0;i<t;i++){var a=bigInt.randBetween(2,n.minus(2));if(!a.modPow(n.prev(),n).isUnit())return false}return true};SmallInteger.prototype.isProbablePrime=BigInteger.prototype.isProbablePrime;BigInteger.prototype.modInv=function(n){var t=bigInt.zero,newT=bigInt.one,r=parseValue(n),newR=this.abs(),q,lastT,lastR;while(!newR.equals(bigInt.zero)){q=r.divide(newR);lastT=t;lastR=r;t=newT;r=newR;newT=lastT.subtract(q.multiply(newT));newR=lastR.subtract(q.multiply(newR))}if(!r.equals(1))throw new Error(this.toString()+" and "+n.toString()+" are not co-prime");if(t.compare(0)===-1){t=t.add(n)}if(this.isNegative()){return t.negate()}return t};SmallInteger.prototype.modInv=BigInteger.prototype.modInv;BigInteger.prototype.next=function(){var value=this.value;if(this.sign){return subtractSmall(value,1,this.sign)}return new BigInteger(addSmall(value,1),this.sign)};SmallInteger.prototype.next=function(){var value=this.value;if(value+1<MAX_INT)return new SmallInteger(value+1);return new BigInteger(MAX_INT_ARR,false)};BigInteger.prototype.prev=function(){var value=this.value;if(this.sign){return new BigInteger(addSmall(value,1),true)}return subtractSmall(value,1,this.sign)};SmallInteger.prototype.prev=function(){var value=this.value;if(value-1>-MAX_INT)return new SmallInteger(value-1);return new BigInteger(MAX_INT_ARR,true)};var powersOfTwo=[1];while(2*powersOfTwo[powersOfTwo.length-1]<=BASE)powersOfTwo.push(2*powersOfTwo[powersOfTwo.length-1]);var powers2Length=powersOfTwo.length,highestPower2=powersOfTwo[powers2Length-1];function shift_isSmall(n){return(typeof n==="number"||typeof n==="string")&&+Math.abs(n)<=BASE||n instanceof BigInteger&&n.value.length<=1}BigInteger.prototype.shiftLeft=function(n){if(!shift_isSmall(n)){throw new Error(String(n)+" is too large for shifting.")}n=+n;if(n<0)return this.shiftRight(-n);var result=this;while(n>=powers2Length){result=result.multiply(highestPower2);n-=powers2Length-1}return result.multiply(powersOfTwo[n])};SmallInteger.prototype.shiftLeft=BigInteger.prototype.shiftLeft;BigInteger.prototype.shiftRight=function(n){var remQuo;if(!shift_isSmall(n)){throw new Error(String(n)+" is too large for shifting.")}n=+n;if(n<0)return this.shiftLeft(-n);var result=this;while(n>=powers2Length){if(result.isZero())return result;remQuo=divModAny(result,highestPower2);result=remQuo[1].isNegative()?remQuo[0].prev():remQuo[0];n-=powers2Length-1}remQuo=divModAny(result,powersOfTwo[n]);return remQuo[1].isNegative()?remQuo[0].prev():remQuo[0]};SmallInteger.prototype.shiftRight=BigInteger.prototype.shiftRight;function bitwise(x,y,fn){y=parseValue(y);var xSign=x.isNegative(),ySign=y.isNegative();var xRem=xSign?x.not():x,yRem=ySign?y.not():y;var xDigit=0,yDigit=0;var xDivMod=null,yDivMod=null;var result=[];while(!xRem.isZero()||!yRem.isZero()){xDivMod=divModAny(xRem,highestPower2);xDigit=xDivMod[1].toJSNumber();if(xSign){xDigit=highestPower2-1-xDigit}yDivMod=divModAny(yRem,highestPower2);yDigit=yDivMod[1].toJSNumber();if(ySign){yDigit=highestPower2-1-yDigit}xRem=xDivMod[0];yRem=yDivMod[0];result.push(fn(xDigit,yDigit))}var sum=fn(xSign?1:0,ySign?1:0)!==0?bigInt(-1):bigInt(0);for(var i=result.length-1;i>=0;i-=1){sum=sum.multiply(highestPower2).add(bigInt(result[i]))}return sum}BigInteger.prototype.not=function(){return this.negate().prev()};SmallInteger.prototype.not=BigInteger.prototype.not;BigInteger.prototype.and=function(n){return bitwise(this,n,function(a,b){return a&b})};SmallInteger.prototype.and=BigInteger.prototype.and;BigInteger.prototype.or=function(n){return bitwise(this,n,function(a,b){return a|b})};SmallInteger.prototype.or=BigInteger.prototype.or;BigInteger.prototype.xor=function(n){return bitwise(this,n,function(a,b){return a^b})};SmallInteger.prototype.xor=BigInteger.prototype.xor;var LOBMASK_I=1<<30,LOBMASK_BI=(BASE&-BASE)*(BASE&-BASE)|LOBMASK_I;function roughLOB(n){var v=n.value,x=typeof v==="number"?v|LOBMASK_I:v[0]+v[1]*BASE|LOBMASK_BI;return x&-x}function max(a,b){a=parseValue(a);b=parseValue(b);return a.greater(b)?a:b}function min(a,b){a=parseValue(a);b=parseValue(b);return a.lesser(b)?a:b}function gcd(a,b){a=parseValue(a).abs();b=parseValue(b).abs();if(a.equals(b))return a;if(a.isZero())return b;if(b.isZero())return a;var c=Integer[1],d,t;while(a.isEven()&&b.isEven()){d=Math.min(roughLOB(a),roughLOB(b));a=a.divide(d);b=b.divide(d);c=c.multiply(d)}while(a.isEven()){a=a.divide(roughLOB(a))}do{while(b.isEven()){b=b.divide(roughLOB(b))}if(a.greater(b)){t=b;b=a;a=t}b=b.subtract(a)}while(!b.isZero());return c.isUnit()?a:a.multiply(c)}function lcm(a,b){a=parseValue(a).abs();b=parseValue(b).abs();return a.divide(gcd(a,b)).multiply(b)}function randBetween(a,b){a=parseValue(a);b=parseValue(b);var low=min(a,b),high=max(a,b);var range=high.subtract(low).add(1);if(range.isSmall)return low.add(Math.floor(Math.random()*range));var length=range.value.length-1;var result=[],restricted=true;for(var i=length;i>=0;i--){var top=restricted?range.value[i]:BASE;var digit=truncate(Math.random()*top);result.unshift(digit);if(digit<top)restricted=false}result=arrayToSmall(result);return low.add(typeof result==="number"?new SmallInteger(result):new BigInteger(result,false))}var parseBase=function(text,base){var length=text.length;var i;var absBase=Math.abs(base);for(var i=0;i<length;i++){var c=text[i].toLowerCase();if(c==="-")continue;if(/[a-z0-9]/.test(c)){if(/[0-9]/.test(c)&&+c>=absBase){if(c==="1"&&absBase===1)continue;throw new Error(c+" is not a valid digit in base "+base+".")}else if(c.charCodeAt(0)-87>=absBase){throw new Error(c+" is not a valid digit in base "+base+".")}}}if(2<=base&&base<=36){if(length<=LOG_MAX_INT/Math.log(base)){var result=parseInt(text,base);if(isNaN(result)){throw new Error(c+" is not a valid digit in base "+base+".")}return new SmallInteger(parseInt(text,base))}}base=parseValue(base);var digits=[];var isNegative=text[0]==="-";for(i=isNegative?1:0;i<text.length;i++){var c=text[i].toLowerCase(),charCode=c.charCodeAt(0);if(48<=charCode&&charCode<=57)digits.push(parseValue(c));else if(97<=charCode&&charCode<=122)digits.push(parseValue(c.charCodeAt(0)-87));else if(c==="<"){var start=i;do{i++}while(text[i]!==">");digits.push(parseValue(text.slice(start+1,i)))}else throw new Error(c+" is not a valid character")}return parseBaseFromArray(digits,base,isNegative)};function parseBaseFromArray(digits,base,isNegative){var val=Integer[0],pow=Integer[1],i;for(i=digits.length-1;i>=0;i--){val=val.add(digits[i].times(pow));pow=pow.times(base)}return isNegative?val.negate():val}function stringify(digit){var v=digit.value;if(typeof v==="number")v=[v];if(v.length===1&&v[0]<=35){return"0123456789abcdefghijklmnopqrstuvwxyz".charAt(v[0])}return"<"+v+">"}function toBase(n,base){base=bigInt(base);if(base.isZero()){if(n.isZero())return"0";throw new Error("Cannot convert nonzero numbers to base 0.")}if(base.equals(-1)){if(n.isZero())return"0";if(n.isNegative())return new Array(1-n).join("10");return"1"+new Array(+n).join("01")}var minusSign="";if(n.isNegative()&&base.isPositive()){minusSign="-";n=n.abs()}if(base.equals(1)){if(n.isZero())return"0";return minusSign+new Array(+n+1).join(1)}var out=[];var left=n,divmod;while(left.isNegative()||left.compareAbs(base)>=0){divmod=left.divmod(base);left=divmod.quotient;var digit=divmod.remainder;if(digit.isNegative()){digit=base.minus(digit).abs();left=left.next()}out.push(stringify(digit))}out.push(stringify(left));return minusSign+out.reverse().join("")}BigInteger.prototype.toString=function(radix){if(radix===undefined)radix=10;if(radix!==10)return toBase(this,radix);var v=this.value,l=v.length,str=String(v[--l]),zeros="0000000",digit;while(--l>=0){digit=String(v[l]);str+=zeros.slice(digit.length)+digit}var sign=this.sign?"-":"";return sign+str};SmallInteger.prototype.toString=function(radix){if(radix===undefined)radix=10;if(radix!=10)return toBase(this,radix);return String(this.value)};BigInteger.prototype.toJSON=SmallInteger.prototype.toJSON=function(){return this.toString()};BigInteger.prototype.valueOf=function(){return+this.toString()};BigInteger.prototype.toJSNumber=BigInteger.prototype.valueOf;SmallInteger.prototype.valueOf=function(){return this.value};SmallInteger.prototype.toJSNumber=SmallInteger.prototype.valueOf;function parseStringValue(v){if(isPrecise(+v)){var x=+v;if(x===truncate(x))return new SmallInteger(x);throw"Invalid integer: "+v}var sign=v[0]==="-";if(sign)v=v.slice(1);var split=v.split(/e/i);if(split.length>2)throw new Error("Invalid integer: "+split.join("e"));if(split.length===2){var exp=split[1];if(exp[0]==="+")exp=exp.slice(1);exp=+exp;if(exp!==truncate(exp)||!isPrecise(exp))throw new Error("Invalid integer: "+exp+" is not a valid exponent.");var text=split[0];var decimalPlace=text.indexOf(".");if(decimalPlace>=0){exp-=text.length-decimalPlace-1;text=text.slice(0,decimalPlace)+text.slice(decimalPlace+1)}if(exp<0)throw new Error("Cannot include negative exponent part for integers");text+=new Array(exp+1).join("0");v=text}var isValid=/^([0-9][0-9]*)$/.test(v);if(!isValid)throw new Error("Invalid integer: "+v);var r=[],max=v.length,l=LOG_BASE,min=max-l;while(max>0){r.push(+v.slice(min,max));min-=l;if(min<0)min=0;max-=l}trim(r);return new BigInteger(r,sign)}function parseNumberValue(v){if(isPrecise(v)){if(v!==truncate(v))throw new Error(v+" is not an integer.");return new SmallInteger(v)}return parseStringValue(v.toString())}function parseValue(v){if(typeof v==="number"){return parseNumberValue(v)}if(typeof v==="string"){return parseStringValue(v)}return v}for(var i=0;i<1e3;i++){Integer[i]=new SmallInteger(i);if(i>0)Integer[-i]=new SmallInteger(-i)}Integer.one=Integer[1];Integer.zero=Integer[0];Integer.minusOne=Integer[-1];Integer.max=max;Integer.min=min;Integer.gcd=gcd;Integer.lcm=lcm;Integer.isInstance=function(x){return x instanceof BigInteger||x instanceof SmallInteger};Integer.randBetween=randBetween;Integer.fromArray=function(digits,base,isNegative){return parseBaseFromArray(digits.map(parseValue),parseValue(base||10),isNegative)};return Integer}();if(typeof module!=="undefined"&&module.hasOwnProperty("exports")){module.exports=bigInt}if(typeof define==="function"&&define.amd){define("big-integer",[],function(){return bigInt})}; bigInt`
// makeSlice convert an unsafe memory pointer with the given type into a Go byte
// slice.
//
// Note, the returned slice uses the same memory area as the input arguments.
// If those are duktape stack items, popping them off **will** make the slice
// contents change.
func makeSlice(ptr unsafe.Pointer, size uint) []byte {
var sl = struct {
addr uintptr
len int
cap int
}{uintptr(ptr), int(size), int(size)}
return *(*[]byte)(unsafe.Pointer(&sl))
}
// popSlice pops a buffer off the JavaScript stack and returns it as a slice.
func popSlice(ctx *duktape.Context) []byte {
blob := common.CopyBytes(makeSlice(ctx.GetBuffer(-1)))
ctx.Pop()
return blob
}
// pushBigInt create a JavaScript BigInteger in the VM.
func pushBigInt(n *big.Int, ctx *duktape.Context) {
ctx.GetGlobalString("bigInt")
ctx.PushString(n.String())
ctx.Call(1)
}
// opWrapper provides a JavaScript wrapper around OpCode.
type opWrapper struct {
op vm.OpCode
}
// pushObject assembles a JSVM object wrapping a swappable opcode and pushes it
// onto the VM stack.
func (ow *opWrapper) pushObject(vm *duktape.Context) {
obj := vm.PushObject()
vm.PushGoFunction(func(ctx *duktape.Context) int { ctx.PushInt(int(ow.op)); return 1 })
vm.PutPropString(obj, "toNumber")
vm.PushGoFunction(func(ctx *duktape.Context) int { ctx.PushString(ow.op.String()); return 1 })
vm.PutPropString(obj, "toString")
vm.PushGoFunction(func(ctx *duktape.Context) int { ctx.PushBoolean(ow.op.IsPush()); return 1 })
vm.PutPropString(obj, "isPush")
}
// memoryWrapper provides a JavaScript wrapper around vm.Memory.
type memoryWrapper struct {
memory *vm.Memory
}
// slice returns the requested range of memory as a byte slice.
func (mw *memoryWrapper) slice(begin, end int64) []byte {
if end == begin {
return []byte{}
}
if end < begin || begin < 0 {
// TODO(karalabe): We can't js-throw from Go inside duktape inside Go. The Go
// runtime goes belly up https://github.com/golang/go/issues/15639.
log.Warn("Tracer accessed out of bound memory", "offset", begin, "end", end)
return nil
}
if mw.memory.Len() < int(end) {
// TODO(karalabe): We can't js-throw from Go inside duktape inside Go. The Go
// runtime goes belly up https://github.com/golang/go/issues/15639.
log.Warn("Tracer accessed out of bound memory", "available", mw.memory.Len(), "offset", begin, "size", end-begin)
return nil
}
return mw.memory.GetCopy(begin, end-begin)
}
// getUint returns the 32 bytes at the specified address interpreted as a uint.
func (mw *memoryWrapper) getUint(addr int64) *big.Int {
if mw.memory.Len() < int(addr)+32 || addr < 0 {
// TODO(karalabe): We can't js-throw from Go inside duktape inside Go. The Go
// runtime goes belly up https://github.com/golang/go/issues/15639.
log.Warn("Tracer accessed out of bound memory", "available", mw.memory.Len(), "offset", addr, "size", 32)
return new(big.Int)
}
return new(big.Int).SetBytes(mw.memory.GetPtr(addr, 32))
}
// pushObject assembles a JSVM object wrapping a swappable memory and pushes it
// onto the VM stack.
func (mw *memoryWrapper) pushObject(vm *duktape.Context) {
obj := vm.PushObject()
// Generate the `slice` method which takes two ints and returns a buffer
vm.PushGoFunction(func(ctx *duktape.Context) int {
blob := mw.slice(int64(ctx.GetInt(-2)), int64(ctx.GetInt(-1)))
ctx.Pop2()
ptr := ctx.PushFixedBuffer(len(blob))
copy(makeSlice(ptr, uint(len(blob))), blob)
return 1
})
vm.PutPropString(obj, "slice")
// Generate the `getUint` method which takes an int and returns a bigint
vm.PushGoFunction(func(ctx *duktape.Context) int {
offset := int64(ctx.GetInt(-1))
ctx.Pop()
pushBigInt(mw.getUint(offset), ctx)
return 1
})
vm.PutPropString(obj, "getUint")
}
// stackWrapper provides a JavaScript wrapper around vm.Stack.
type stackWrapper struct {
stack *vm.Stack
}
// peek returns the nth-from-the-top element of the stack.
func (sw *stackWrapper) peek(idx int) *big.Int {
if len(sw.stack.Data()) <= idx || idx < 0 {
// TODO(karalabe): We can't js-throw from Go inside duktape inside Go. The Go
// runtime goes belly up https://github.com/golang/go/issues/15639.
log.Warn("Tracer accessed out of bound stack", "size", len(sw.stack.Data()), "index", idx)
return new(big.Int)
}
return sw.stack.Back(idx).ToBig()
}
// pushObject assembles a JSVM object wrapping a swappable stack and pushes it
// onto the VM stack.
func (sw *stackWrapper) pushObject(vm *duktape.Context) {
obj := vm.PushObject()
vm.PushGoFunction(func(ctx *duktape.Context) int { ctx.PushInt(len(sw.stack.Data())); return 1 })
vm.PutPropString(obj, "length")
// Generate the `peek` method which takes an int and returns a bigint
vm.PushGoFunction(func(ctx *duktape.Context) int {
offset := ctx.GetInt(-1)
ctx.Pop()
pushBigInt(sw.peek(offset), ctx)
return 1
})
vm.PutPropString(obj, "peek")
}
// dbWrapper provides a JavaScript wrapper around vm.Database.
type dbWrapper struct {
db vm.StateDB
}
// pushObject assembles a JSVM object wrapping a swappable database and pushes it
// onto the VM stack.
func (dw *dbWrapper) pushObject(vm *duktape.Context) {
obj := vm.PushObject()
// Push the wrapper for statedb.GetBalance
vm.PushGoFunction(func(ctx *duktape.Context) int {
pushBigInt(dw.db.GetBalance(common.BytesToAddress(popSlice(ctx))), ctx)
return 1
})
vm.PutPropString(obj, "getBalance")
// Push the wrapper for statedb.GetNonce
vm.PushGoFunction(func(ctx *duktape.Context) int {
ctx.PushInt(int(dw.db.GetNonce(common.BytesToAddress(popSlice(ctx)))))
return 1
})
vm.PutPropString(obj, "getNonce")
// Push the wrapper for statedb.GetCode
vm.PushGoFunction(func(ctx *duktape.Context) int {
code := dw.db.GetCode(common.BytesToAddress(popSlice(ctx)))
ptr := ctx.PushFixedBuffer(len(code))
copy(makeSlice(ptr, uint(len(code))), code)
return 1
})
vm.PutPropString(obj, "getCode")
// Push the wrapper for statedb.GetState
vm.PushGoFunction(func(ctx *duktape.Context) int {
hash := popSlice(ctx)
addr := popSlice(ctx)
state := dw.db.GetState(common.BytesToAddress(addr), common.BytesToHash(hash))
ptr := ctx.PushFixedBuffer(len(state))
copy(makeSlice(ptr, uint(len(state))), state[:])
return 1
})
vm.PutPropString(obj, "getState")
// Push the wrapper for statedb.Exists
vm.PushGoFunction(func(ctx *duktape.Context) int {
ctx.PushBoolean(dw.db.Exist(common.BytesToAddress(popSlice(ctx))))
return 1
})
vm.PutPropString(obj, "exists")
}
// contractWrapper provides a JavaScript wrapper around vm.Contract
type contractWrapper struct {
contract *vm.Contract
}
// pushObject assembles a JSVM object wrapping a swappable contract and pushes it
// onto the VM stack.
func (cw *contractWrapper) pushObject(vm *duktape.Context) {
obj := vm.PushObject()
// Push the wrapper for contract.Caller
vm.PushGoFunction(func(ctx *duktape.Context) int {
ptr := ctx.PushFixedBuffer(20)
copy(makeSlice(ptr, 20), cw.contract.Caller().Bytes())
return 1
})
vm.PutPropString(obj, "getCaller")
// Push the wrapper for contract.Address
vm.PushGoFunction(func(ctx *duktape.Context) int {
ptr := ctx.PushFixedBuffer(20)
copy(makeSlice(ptr, 20), cw.contract.Address().Bytes())
return 1
})
vm.PutPropString(obj, "getAddress")
// Push the wrapper for contract.Value
vm.PushGoFunction(func(ctx *duktape.Context) int {
pushBigInt(cw.contract.Value(), ctx)
return 1
})
vm.PutPropString(obj, "getValue")
// Push the wrapper for contract.Input
vm.PushGoFunction(func(ctx *duktape.Context) int {
blob := cw.contract.Input
ptr := ctx.PushFixedBuffer(len(blob))
copy(makeSlice(ptr, uint(len(blob))), blob)
return 1
})
vm.PutPropString(obj, "getInput")
}
type frame struct {
typ *string
from *common.Address
to *common.Address
input []byte
gas *uint
value *big.Int
}
func newFrame() *frame {
return &frame{
typ: new(string),
from: new(common.Address),
to: new(common.Address),
gas: new(uint),
}
}
func (f *frame) pushObject(vm *duktape.Context) {
obj := vm.PushObject()
vm.PushGoFunction(func(ctx *duktape.Context) int { pushValue(ctx, *f.typ); return 1 })
vm.PutPropString(obj, "getType")
vm.PushGoFunction(func(ctx *duktape.Context) int { pushValue(ctx, *f.from); return 1 })
vm.PutPropString(obj, "getFrom")
vm.PushGoFunction(func(ctx *duktape.Context) int { pushValue(ctx, *f.to); return 1 })
vm.PutPropString(obj, "getTo")
vm.PushGoFunction(func(ctx *duktape.Context) int { pushValue(ctx, f.input); return 1 })
vm.PutPropString(obj, "getInput")
vm.PushGoFunction(func(ctx *duktape.Context) int { pushValue(ctx, *f.gas); return 1 })
vm.PutPropString(obj, "getGas")
vm.PushGoFunction(func(ctx *duktape.Context) int {
if f.value != nil {
pushValue(ctx, f.value)
} else {
ctx.PushUndefined()
}
return 1
})
vm.PutPropString(obj, "getValue")
}
type frameResult struct {
gasUsed *uint
output []byte
errorValue *string
}
func newFrameResult() *frameResult {
return &frameResult{
gasUsed: new(uint),
}
}
func (r *frameResult) pushObject(vm *duktape.Context) {
obj := vm.PushObject()
vm.PushGoFunction(func(ctx *duktape.Context) int { pushValue(ctx, *r.gasUsed); return 1 })
vm.PutPropString(obj, "getGasUsed")
vm.PushGoFunction(func(ctx *duktape.Context) int { pushValue(ctx, r.output); return 1 })
vm.PutPropString(obj, "getOutput")
vm.PushGoFunction(func(ctx *duktape.Context) int {
if r.errorValue != nil {
pushValue(ctx, *r.errorValue)
} else {
ctx.PushUndefined()
}
return 1
})
vm.PutPropString(obj, "getError")
}
// jsTracer provides an implementation of Tracer that evaluates a Javascript
// function for each VM execution step.
type jsTracer struct {
vm *duktape.Context // Javascript VM instance
tracerObject int // Stack index of the tracer JavaScript object
stateObject int // Stack index of the global state to pull arguments from
opWrapper *opWrapper // Wrapper around the VM opcode
stackWrapper *stackWrapper // Wrapper around the VM stack
memoryWrapper *memoryWrapper // Wrapper around the VM memory
contractWrapper *contractWrapper // Wrapper around the contract object
dbWrapper *dbWrapper // Wrapper around the VM environment
pcValue *uint // Swappable pc value wrapped by a log accessor
gasValue *uint // Swappable gas value wrapped by a log accessor
costValue *uint // Swappable cost value wrapped by a log accessor
depthValue *uint // Swappable depth value wrapped by a log accessor
errorValue *string // Swappable error value wrapped by a log accessor
refundValue *uint // Swappable refund value wrapped by a log accessor
frame *frame // Represents entry into call frame. Fields are swappable
frameResult *frameResult // Represents exit from a call frame. Fields are swappable
ctx map[string]interface{} // Transaction context gathered throughout execution
err error // Error, if one has occurred
interrupt uint32 // Atomic flag to signal execution interruption
reason error // Textual reason for the interruption
activePrecompiles []common.Address // Updated on CaptureStart based on given rules
traceSteps bool // When true, will invoke step() on each opcode
traceCallFrames bool // When true, will invoke enter() and exit() js funcs
}
// Context contains some contextual infos for a transaction execution that is not
// available from within the EVM object.
type Context struct {
BlockHash common.Hash // Hash of the block the tx is contained within (zero if dangling tx or call)
TxIndex int // Index of the transaction within a block (zero if dangling tx or call)
TxHash common.Hash // Hash of the transaction being traced (zero if dangling call)
}
// New instantiates a new tracer instance. code specifies a Javascript snippet,
// which must evaluate to an expression returning an object with 'step', 'fault'
// and 'result' functions.
func newJsTracer(code string, ctx *Context) (*jsTracer, error) {
tracer := &jsTracer{
vm: duktape.New(),
ctx: make(map[string]interface{}),
opWrapper: new(opWrapper),
stackWrapper: new(stackWrapper),
memoryWrapper: new(memoryWrapper),
contractWrapper: new(contractWrapper),
dbWrapper: new(dbWrapper),
pcValue: new(uint),
gasValue: new(uint),
costValue: new(uint),
depthValue: new(uint),
refundValue: new(uint),
frame: newFrame(),
frameResult: newFrameResult(),
}
if ctx.BlockHash != (common.Hash{}) {
tracer.ctx["blockHash"] = ctx.BlockHash
if ctx.TxHash != (common.Hash{}) {
tracer.ctx["txIndex"] = ctx.TxIndex
tracer.ctx["txHash"] = ctx.TxHash
}
}
// Set up builtins for this environment
tracer.vm.PushGlobalGoFunction("toHex", func(ctx *duktape.Context) int {
ctx.PushString(hexutil.Encode(popSlice(ctx)))
return 1
})
tracer.vm.PushGlobalGoFunction("toWord", func(ctx *duktape.Context) int {
var word common.Hash
if ptr, size := ctx.GetBuffer(-1); ptr != nil {
word = common.BytesToHash(makeSlice(ptr, size))
} else {
word = common.HexToHash(ctx.GetString(-1))
}
ctx.Pop()
copy(makeSlice(ctx.PushFixedBuffer(32), 32), word[:])
return 1
})
tracer.vm.PushGlobalGoFunction("toAddress", func(ctx *duktape.Context) int {
var addr common.Address
if ptr, size := ctx.GetBuffer(-1); ptr != nil {
addr = common.BytesToAddress(makeSlice(ptr, size))
} else {
addr = common.HexToAddress(ctx.GetString(-1))
}
ctx.Pop()
copy(makeSlice(ctx.PushFixedBuffer(20), 20), addr[:])
return 1
})
tracer.vm.PushGlobalGoFunction("toContract", func(ctx *duktape.Context) int {
var from common.Address
if ptr, size := ctx.GetBuffer(-2); ptr != nil {
from = common.BytesToAddress(makeSlice(ptr, size))
} else {
from = common.HexToAddress(ctx.GetString(-2))
}
nonce := uint64(ctx.GetInt(-1))
ctx.Pop2()
contract := crypto.CreateAddress(from, nonce)
copy(makeSlice(ctx.PushFixedBuffer(20), 20), contract[:])
return 1
})
tracer.vm.PushGlobalGoFunction("toContract2", func(ctx *duktape.Context) int {
var from common.Address
if ptr, size := ctx.GetBuffer(-3); ptr != nil {
from = common.BytesToAddress(makeSlice(ptr, size))
} else {
from = common.HexToAddress(ctx.GetString(-3))
}
// Retrieve salt hex string from js stack
salt := common.HexToHash(ctx.GetString(-2))
// Retrieve code slice from js stack
var code []byte
if ptr, size := ctx.GetBuffer(-1); ptr != nil {
code = common.CopyBytes(makeSlice(ptr, size))
} else {
code = common.FromHex(ctx.GetString(-1))
}
codeHash := crypto.Keccak256(code)
ctx.Pop3()
contract := crypto.CreateAddress2(from, salt, codeHash)
copy(makeSlice(ctx.PushFixedBuffer(20), 20), contract[:])
return 1
})
tracer.vm.PushGlobalGoFunction("isPrecompiled", func(ctx *duktape.Context) int {
addr := common.BytesToAddress(popSlice(ctx))
for _, p := range tracer.activePrecompiles {
if p == addr {
ctx.PushBoolean(true)
return 1
}
}
ctx.PushBoolean(false)
return 1
})
tracer.vm.PushGlobalGoFunction("slice", func(ctx *duktape.Context) int {
start, end := ctx.GetInt(-2), ctx.GetInt(-1)
ctx.Pop2()
blob := popSlice(ctx)
size := end - start
if start < 0 || start > end || end > len(blob) {
// TODO(karalabe): We can't js-throw from Go inside duktape inside Go. The Go
// runtime goes belly up https://github.com/golang/go/issues/15639.
log.Warn("Tracer accessed out of bound memory", "available", len(blob), "offset", start, "size", size)
ctx.PushFixedBuffer(0)
return 1
}
copy(makeSlice(ctx.PushFixedBuffer(size), uint(size)), blob[start:end])
return 1
})
// Push the JavaScript tracer as object #0 onto the JSVM stack and validate it
if err := tracer.vm.PevalString("(" + code + ")"); err != nil {
log.Warn("Failed to compile tracer", "err", err)
return nil, err
}
tracer.tracerObject = 0 // yeah, nice, eval can't return the index itself
hasStep := tracer.vm.GetPropString(tracer.tracerObject, "step")
tracer.vm.Pop()
if !tracer.vm.GetPropString(tracer.tracerObject, "fault") {
return nil, fmt.Errorf("trace object must expose a function fault()")
}
tracer.vm.Pop()
if !tracer.vm.GetPropString(tracer.tracerObject, "result") {
return nil, fmt.Errorf("trace object must expose a function result()")
}
tracer.vm.Pop()
hasEnter := tracer.vm.GetPropString(tracer.tracerObject, "enter")
tracer.vm.Pop()
hasExit := tracer.vm.GetPropString(tracer.tracerObject, "exit")
tracer.vm.Pop()
if hasEnter != hasExit {
return nil, fmt.Errorf("trace object must expose either both or none of enter() and exit()")
}
tracer.traceCallFrames = hasEnter && hasExit
tracer.traceSteps = hasStep
// Tracer is valid, inject the big int library to access large numbers
tracer.vm.EvalString(bigIntegerJS)
tracer.vm.PutGlobalString("bigInt")
// Push the global environment state as object #1 into the JSVM stack
tracer.stateObject = tracer.vm.PushObject()
logObject := tracer.vm.PushObject()
tracer.opWrapper.pushObject(tracer.vm)
tracer.vm.PutPropString(logObject, "op")
tracer.stackWrapper.pushObject(tracer.vm)
tracer.vm.PutPropString(logObject, "stack")
tracer.memoryWrapper.pushObject(tracer.vm)
tracer.vm.PutPropString(logObject, "memory")
tracer.contractWrapper.pushObject(tracer.vm)
tracer.vm.PutPropString(logObject, "contract")
tracer.vm.PushGoFunction(func(ctx *duktape.Context) int { ctx.PushUint(*tracer.pcValue); return 1 })
tracer.vm.PutPropString(logObject, "getPC")
tracer.vm.PushGoFunction(func(ctx *duktape.Context) int { ctx.PushUint(*tracer.gasValue); return 1 })
tracer.vm.PutPropString(logObject, "getGas")
tracer.vm.PushGoFunction(func(ctx *duktape.Context) int { ctx.PushUint(*tracer.costValue); return 1 })
tracer.vm.PutPropString(logObject, "getCost")
tracer.vm.PushGoFunction(func(ctx *duktape.Context) int { ctx.PushUint(*tracer.depthValue); return 1 })
tracer.vm.PutPropString(logObject, "getDepth")
tracer.vm.PushGoFunction(func(ctx *duktape.Context) int { ctx.PushUint(*tracer.refundValue); return 1 })
tracer.vm.PutPropString(logObject, "getRefund")
tracer.vm.PushGoFunction(func(ctx *duktape.Context) int {
if tracer.errorValue != nil {
ctx.PushString(*tracer.errorValue)
} else {
ctx.PushUndefined()
}
return 1
})
tracer.vm.PutPropString(logObject, "getError")
tracer.vm.PutPropString(tracer.stateObject, "log")
tracer.frame.pushObject(tracer.vm)
tracer.vm.PutPropString(tracer.stateObject, "frame")
tracer.frameResult.pushObject(tracer.vm)
tracer.vm.PutPropString(tracer.stateObject, "frameResult")
tracer.dbWrapper.pushObject(tracer.vm)
tracer.vm.PutPropString(tracer.stateObject, "db")
return tracer, nil
}
// Stop terminates execution of the tracer at the first opportune moment.
func (jst *jsTracer) Stop(err error) {
jst.reason = err
atomic.StoreUint32(&jst.interrupt, 1)
}
// call executes a method on a JS object, catching any errors, formatting and
// returning them as error objects.
func (jst *jsTracer) call(noret bool, method string, args ...string) (json.RawMessage, error) {
// Execute the JavaScript call and return any error
jst.vm.PushString(method)
for _, arg := range args {
jst.vm.GetPropString(jst.stateObject, arg)
}
code := jst.vm.PcallProp(jst.tracerObject, len(args))
defer jst.vm.Pop()
if code != 0 {
err := jst.vm.SafeToString(-1)
return nil, errors.New(err)
}
// No error occurred, extract return value and return
if noret {
return nil, nil
}
// Push a JSON marshaller onto the stack. We can't marshal from the out-
// side because duktape can crash on large nestings and we can't catch
// C++ exceptions ourselves from Go. TODO(karalabe): Yuck, why wrap?!
jst.vm.PushString("(JSON.stringify)")
jst.vm.Eval()
jst.vm.Swap(-1, -2)
if code = jst.vm.Pcall(1); code != 0 {
err := jst.vm.SafeToString(-1)
return nil, errors.New(err)
}
return json.RawMessage(jst.vm.SafeToString(-1)), nil
}
func wrapError(context string, err error) error {
return fmt.Errorf("%v in server-side tracer function '%v'", err, context)
}
// CaptureStart implements the Tracer interface to initialize the tracing operation.
func (jst *jsTracer) CaptureStart(env *vm.EVM, from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int) {
jst.ctx["type"] = "CALL"
if create {
jst.ctx["type"] = "CREATE"
}
jst.ctx["from"] = from
jst.ctx["to"] = to
jst.ctx["input"] = input
jst.ctx["gas"] = gas
jst.ctx["gasPrice"] = env.TxContext.GasPrice
jst.ctx["value"] = value
// Initialize the context
jst.ctx["block"] = env.Context.BlockNumber.Uint64()
jst.dbWrapper.db = env.StateDB
// Update list of precompiles based on current block
rules := env.ChainConfig().Rules(env.Context.BlockNumber)
jst.activePrecompiles = vm.ActivePrecompiles(rules)
// Compute intrinsic gas
isHomestead := env.ChainConfig().IsHomestead(env.Context.BlockNumber)
isIstanbul := env.ChainConfig().IsIstanbul(env.Context.BlockNumber)
intrinsicGas, err := core.IntrinsicGas(input, nil, jst.ctx["type"] == "CREATE", isHomestead, isIstanbul)
if err != nil {
return
}
jst.ctx["intrinsicGas"] = intrinsicGas
}
// CaptureState implements the Tracer interface to trace a single step of VM execution.
func (jst *jsTracer) CaptureState(env *vm.EVM, pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, rData []byte, depth int, err error) {
if !jst.traceSteps {
return
}
if jst.err != nil {
return
}
// If tracing was interrupted, set the error and stop
if atomic.LoadUint32(&jst.interrupt) > 0 {
jst.err = jst.reason
env.Cancel()
return
}
jst.opWrapper.op = op
jst.stackWrapper.stack = scope.Stack
jst.memoryWrapper.memory = scope.Memory
jst.contractWrapper.contract = scope.Contract
*jst.pcValue = uint(pc)
*jst.gasValue = uint(gas)
*jst.costValue = uint(cost)
*jst.depthValue = uint(depth)
*jst.refundValue = uint(env.StateDB.GetRefund())
jst.errorValue = nil
if err != nil {
jst.errorValue = new(string)
*jst.errorValue = err.Error()
}
if _, err := jst.call(true, "step", "log", "db"); err != nil {
jst.err = wrapError("step", err)
}
}
// CaptureFault implements the Tracer interface to trace an execution fault
func (jst *jsTracer) CaptureFault(env *vm.EVM, pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, depth int, err error) {
if jst.err != nil {
return
}
// Apart from the error, everything matches the previous invocation
jst.errorValue = new(string)
*jst.errorValue = err.Error()
if _, err := jst.call(true, "fault", "log", "db"); err != nil {
jst.err = wrapError("fault", err)
}
}
// CaptureEnd is called after the call finishes to finalize the tracing.
func (jst *jsTracer) CaptureEnd(output []byte, gasUsed uint64, t time.Duration, err error) {
jst.ctx["output"] = output
jst.ctx["time"] = t.String()
jst.ctx["gasUsed"] = gasUsed
if err != nil {
jst.ctx["error"] = err.Error()
}
}
// CaptureEnter is called when EVM enters a new scope (via call, create or selfdestruct).
func (jst *jsTracer) CaptureEnter(typ vm.OpCode, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int) {
if !jst.traceCallFrames {
return
}
if jst.err != nil {
return
}
// If tracing was interrupted, set the error and stop
if atomic.LoadUint32(&jst.interrupt) > 0 {
jst.err = jst.reason
return
}
*jst.frame.typ = typ.String()
*jst.frame.from = from
*jst.frame.to = to
jst.frame.input = common.CopyBytes(input)
*jst.frame.gas = uint(gas)
jst.frame.value = nil
if value != nil {
jst.frame.value = new(big.Int).SetBytes(value.Bytes())
}
if _, err := jst.call(true, "enter", "frame"); err != nil {
jst.err = wrapError("enter", err)
}
}
// CaptureExit is called when EVM exits a scope, even if the scope didn't
// execute any code.
func (jst *jsTracer) CaptureExit(output []byte, gasUsed uint64, err error) {
if !jst.traceCallFrames {
return
}
// If tracing was interrupted, set the error and stop
if atomic.LoadUint32(&jst.interrupt) > 0 {
jst.err = jst.reason
return
}
jst.frameResult.output = common.CopyBytes(output)
*jst.frameResult.gasUsed = uint(gasUsed)
jst.frameResult.errorValue = nil
if err != nil {
jst.frameResult.errorValue = new(string)
*jst.frameResult.errorValue = err.Error()
}
if _, err := jst.call(true, "exit", "frameResult"); err != nil {
jst.err = wrapError("exit", err)
}
}
// GetResult calls the Javascript 'result' function and returns its value, or any accumulated error
func (jst *jsTracer) GetResult() (json.RawMessage, error) {
// Transform the context into a JavaScript object and inject into the state
obj := jst.vm.PushObject()
for key, val := range jst.ctx {
jst.addToObj(obj, key, val)
}
jst.vm.PutPropString(jst.stateObject, "ctx")
// Finalize the trace and return the results
result, err := jst.call(false, "result", "ctx", "db")
if err != nil {
jst.err = wrapError("result", err)
}
// Clean up the JavaScript environment
jst.vm.DestroyHeap()
jst.vm.Destroy()
return result, jst.err
}
// addToObj pushes a field to a JS object.
func (jst *jsTracer) addToObj(obj int, key string, val interface{}) {
pushValue(jst.vm, val)
jst.vm.PutPropString(obj, key)
}
func pushValue(ctx *duktape.Context, val interface{}) {
switch val := val.(type) {
case uint64:
ctx.PushUint(uint(val))
case string:
ctx.PushString(val)
case []byte:
ptr := ctx.PushFixedBuffer(len(val))
copy(makeSlice(ptr, uint(len(val))), val)
case common.Address:
ptr := ctx.PushFixedBuffer(20)
copy(makeSlice(ptr, 20), val[:])
case *big.Int:
pushBigInt(val, ctx)
case int:
ctx.PushInt(val)
case uint:
ctx.PushUint(val)
case common.Hash:
ptr := ctx.PushFixedBuffer(32)
copy(makeSlice(ptr, 32), val[:])
default:
panic(fmt.Sprintf("unsupported type: %T", val))
}
}
eth/tracers/js/tracer.go 0 → 100644
View file @ 6b9c77f0
// 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 js is a collection of tracers written in javascript.
package js
import (
"encoding/json"
"errors"
"fmt"
"math/big"
"strings"
"sync/atomic"
"time"
"unicode"
"unsafe"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/crypto"
tracers2 "github.com/ethereum/go-ethereum/eth/tracers"
"github.com/ethereum/go-ethereum/eth/tracers/js/internal/tracers"
"github.com/ethereum/go-ethereum/log"
"gopkg.in/olebedev/go-duktape.v3"
)
// camel converts a snake cased input string into a camel cased output.
func camel(str string) string {
pieces := strings.Split(str, "_")
for i := 1; i < len(pieces); i++ {
pieces[i] = string(unicode.ToUpper(rune(pieces[i][0]))) + pieces[i][1:]
}
return strings.Join(pieces, "")
}
var assetTracers = make(map[string]string)
// init retrieves the JavaScript transaction tracers included in go-ethereum.
func init() {
for _, file := range tracers.AssetNames() {
name := camel(strings.TrimSuffix(file, ".js"))
assetTracers[name] = string(tracers.MustAsset(file))
}
tracers2.RegisterLookup(true, newJsTracer)
}
// makeSlice convert an unsafe memory pointer with the given type into a Go byte
// slice.
//
// Note, the returned slice uses the same memory area as the input arguments.
// If those are duktape stack items, popping them off **will** make the slice
// contents change.
func makeSlice(ptr unsafe.Pointer, size uint) []byte {
var sl = struct {
addr uintptr
len int
cap int
}{uintptr(ptr), int(size), int(size)}
return *(*[]byte)(unsafe.Pointer(&sl))
}
// popSlice pops a buffer off the JavaScript stack and returns it as a slice.
func popSlice(ctx *duktape.Context) []byte {
blob := common.CopyBytes(makeSlice(ctx.GetBuffer(-1)))
ctx.Pop()
return blob
}
// pushBigInt create a JavaScript BigInteger in the VM.
func pushBigInt(n *big.Int, ctx *duktape.Context) {
ctx.GetGlobalString("bigInt")
ctx.PushString(n.String())
ctx.Call(1)
}
// opWrapper provides a JavaScript wrapper around OpCode.
type opWrapper struct {
op vm.OpCode
}
// pushObject assembles a JSVM object wrapping a swappable opcode and pushes it
// onto the VM stack.
func (ow *opWrapper) pushObject(vm *duktape.Context) {
obj := vm.PushObject()
vm.PushGoFunction(func(ctx *duktape.Context) int { ctx.PushInt(int(ow.op)); return 1 })
vm.PutPropString(obj, "toNumber")
vm.PushGoFunction(func(ctx *duktape.Context) int { ctx.PushString(ow.op.String()); return 1 })
vm.PutPropString(obj, "toString")
vm.PushGoFunction(func(ctx *duktape.Context) int { ctx.PushBoolean(ow.op.IsPush()); return 1 })
vm.PutPropString(obj, "isPush")
}
// memoryWrapper provides a JavaScript wrapper around vm.Memory.
type memoryWrapper struct {
memory *vm.Memory
}
// slice returns the requested range of memory as a byte slice.
func (mw *memoryWrapper) slice(begin, end int64) []byte {
if end == begin {
return []byte{}
}
if end < begin || begin < 0 {
// TODO(karalabe): We can't js-throw from Go inside duktape inside Go. The Go
// runtime goes belly up https://github.com/golang/go/issues/15639.
log.Warn("Tracer accessed out of bound memory", "offset", begin, "end", end)
return nil
}
if mw.memory.Len() < int(end) {
// TODO(karalabe): We can't js-throw from Go inside duktape inside Go. The Go
// runtime goes belly up https://github.com/golang/go/issues/15639.
log.Warn("Tracer accessed out of bound memory", "available", mw.memory.Len(), "offset", begin, "size", end-begin)
return nil
}
return mw.memory.GetCopy(begin, end-begin)
}
// getUint returns the 32 bytes at the specified address interpreted as a uint.
func (mw *memoryWrapper) getUint(addr int64) *big.Int {
if mw.memory.Len() < int(addr)+32 || addr < 0 {
// TODO(karalabe): We can't js-throw from Go inside duktape inside Go. The Go
// runtime goes belly up https://github.com/golang/go/issues/15639.
log.Warn("Tracer accessed out of bound memory", "available", mw.memory.Len(), "offset", addr, "size", 32)
return new(big.Int)
}
return new(big.Int).SetBytes(mw.memory.GetPtr(addr, 32))
}
// pushObject assembles a JSVM object wrapping a swappable memory and pushes it
// onto the VM stack.
func (mw *memoryWrapper) pushObject(vm *duktape.Context) {
obj := vm.PushObject()
// Generate the `slice` method which takes two ints and returns a buffer
vm.PushGoFunction(func(ctx *duktape.Context) int {
blob := mw.slice(int64(ctx.GetInt(-2)), int64(ctx.GetInt(-1)))
ctx.Pop2()
ptr := ctx.PushFixedBuffer(len(blob))
copy(makeSlice(ptr, uint(len(blob))), blob)
return 1
})
vm.PutPropString(obj, "slice")
// Generate the `getUint` method which takes an int and returns a bigint
vm.PushGoFunction(func(ctx *duktape.Context) int {
offset := int64(ctx.GetInt(-1))
ctx.Pop()
pushBigInt(mw.getUint(offset), ctx)
return 1
})
vm.PutPropString(obj, "getUint")
}
// stackWrapper provides a JavaScript wrapper around vm.Stack.
type stackWrapper struct {
stack *vm.Stack
}
// peek returns the nth-from-the-top element of the stack.
func (sw *stackWrapper) peek(idx int) *big.Int {
if len(sw.stack.Data()) <= idx || idx < 0 {
// TODO(karalabe): We can't js-throw from Go inside duktape inside Go. The Go
// runtime goes belly up https://github.com/golang/go/issues/15639.
log.Warn("Tracer accessed out of bound stack", "size", len(sw.stack.Data()), "index", idx)
return new(big.Int)
}
return sw.stack.Back(idx).ToBig()
}
// pushObject assembles a JSVM object wrapping a swappable stack and pushes it
// onto the VM stack.
func (sw *stackWrapper) pushObject(vm *duktape.Context) {
obj := vm.PushObject()
vm.PushGoFunction(func(ctx *duktape.Context) int { ctx.PushInt(len(sw.stack.Data())); return 1 })
vm.PutPropString(obj, "length")
// Generate the `peek` method which takes an int and returns a bigint
vm.PushGoFunction(func(ctx *duktape.Context) int {
offset := ctx.GetInt(-1)
ctx.Pop()
pushBigInt(sw.peek(offset), ctx)
return 1
})
vm.PutPropString(obj, "peek")
}
// dbWrapper provides a JavaScript wrapper around vm.Database.
type dbWrapper struct {
db vm.StateDB
}
// pushObject assembles a JSVM object wrapping a swappable database and pushes it
// onto the VM stack.
func (dw *dbWrapper) pushObject(vm *duktape.Context) {
obj := vm.PushObject()
// Push the wrapper for statedb.GetBalance
vm.PushGoFunction(func(ctx *duktape.Context) int {
pushBigInt(dw.db.GetBalance(common.BytesToAddress(popSlice(ctx))), ctx)
return 1
})
vm.PutPropString(obj, "getBalance")
// Push the wrapper for statedb.GetNonce
vm.PushGoFunction(func(ctx *duktape.Context) int {
ctx.PushInt(int(dw.db.GetNonce(common.BytesToAddress(popSlice(ctx)))))
return 1
})
vm.PutPropString(obj, "getNonce")
// Push the wrapper for statedb.GetCode
vm.PushGoFunction(func(ctx *duktape.Context) int {
code := dw.db.GetCode(common.BytesToAddress(popSlice(ctx)))
ptr := ctx.PushFixedBuffer(len(code))
copy(makeSlice(ptr, uint(len(code))), code)
return 1
})
vm.PutPropString(obj, "getCode")
// Push the wrapper for statedb.GetState
vm.PushGoFunction(func(ctx *duktape.Context) int {
hash := popSlice(ctx)
addr := popSlice(ctx)
state := dw.db.GetState(common.BytesToAddress(addr), common.BytesToHash(hash))
ptr := ctx.PushFixedBuffer(len(state))
copy(makeSlice(ptr, uint(len(state))), state[:])
return 1
})
vm.PutPropString(obj, "getState")
// Push the wrapper for statedb.Exists
vm.PushGoFunction(func(ctx *duktape.Context) int {
ctx.PushBoolean(dw.db.Exist(common.BytesToAddress(popSlice(ctx))))
return 1
})
vm.PutPropString(obj, "exists")
}
// contractWrapper provides a JavaScript wrapper around vm.Contract
type contractWrapper struct {
contract *vm.Contract
}
// pushObject assembles a JSVM object wrapping a swappable contract and pushes it
// onto the VM stack.
func (cw *contractWrapper) pushObject(vm *duktape.Context) {
obj := vm.PushObject()
// Push the wrapper for contract.Caller
vm.PushGoFunction(func(ctx *duktape.Context) int {
ptr := ctx.PushFixedBuffer(20)
copy(makeSlice(ptr, 20), cw.contract.Caller().Bytes())
return 1
})
vm.PutPropString(obj, "getCaller")
// Push the wrapper for contract.Address
vm.PushGoFunction(func(ctx *duktape.Context) int {
ptr := ctx.PushFixedBuffer(20)
copy(makeSlice(ptr, 20), cw.contract.Address().Bytes())
return 1
})
vm.PutPropString(obj, "getAddress")
// Push the wrapper for contract.Value
vm.PushGoFunction(func(ctx *duktape.Context) int {
pushBigInt(cw.contract.Value(), ctx)
return 1
})
vm.PutPropString(obj, "getValue")
// Push the wrapper for contract.Input
vm.PushGoFunction(func(ctx *duktape.Context) int {
blob := cw.contract.Input
ptr := ctx.PushFixedBuffer(len(blob))
copy(makeSlice(ptr, uint(len(blob))), blob)
return 1
})
vm.PutPropString(obj, "getInput")
}
type frame struct {
typ *string
from *common.Address
to *common.Address
input []byte
gas *uint
value *big.Int
}
func newFrame() *frame {
return &frame{
typ: new(string),
from: new(common.Address),
to: new(common.Address),
gas: new(uint),
}
}
func (f *frame) pushObject(vm *duktape.Context) {
obj := vm.PushObject()
vm.PushGoFunction(func(ctx *duktape.Context) int { pushValue(ctx, *f.typ); return 1 })
vm.PutPropString(obj, "getType")
vm.PushGoFunction(func(ctx *duktape.Context) int { pushValue(ctx, *f.from); return 1 })
vm.PutPropString(obj, "getFrom")
vm.PushGoFunction(func(ctx *duktape.Context) int { pushValue(ctx, *f.to); return 1 })
vm.PutPropString(obj, "getTo")
vm.PushGoFunction(func(ctx *duktape.Context) int { pushValue(ctx, f.input); return 1 })
vm.PutPropString(obj, "getInput")
vm.PushGoFunction(func(ctx *duktape.Context) int { pushValue(ctx, *f.gas); return 1 })
vm.PutPropString(obj, "getGas")
vm.PushGoFunction(func(ctx *duktape.Context) int {
if f.value != nil {
pushValue(ctx, f.value)
} else {
ctx.PushUndefined()
}
return 1
})
vm.PutPropString(obj, "getValue")
}
type frameResult struct {
gasUsed *uint
output []byte
errorValue *string
}
func newFrameResult() *frameResult {
return &frameResult{
gasUsed: new(uint),
}
}
func (r *frameResult) pushObject(vm *duktape.Context) {
obj := vm.PushObject()
vm.PushGoFunction(func(ctx *duktape.Context) int { pushValue(ctx, *r.gasUsed); return 1 })
vm.PutPropString(obj, "getGasUsed")
vm.PushGoFunction(func(ctx *duktape.Context) int { pushValue(ctx, r.output); return 1 })
vm.PutPropString(obj, "getOutput")
vm.PushGoFunction(func(ctx *duktape.Context) int {
if r.errorValue != nil {
pushValue(ctx, *r.errorValue)
} else {
ctx.PushUndefined()
}
return 1
})
vm.PutPropString(obj, "getError")
}
// jsTracer provides an implementation of Tracer that evaluates a Javascript
// function for each VM execution step.
type jsTracer struct {
vm *duktape.Context // Javascript VM instance
env *vm.EVM // EVM instance executing the code being traced
tracerObject int // Stack index of the tracer JavaScript object
stateObject int // Stack index of the global state to pull arguments from
opWrapper *opWrapper // Wrapper around the VM opcode
stackWrapper *stackWrapper // Wrapper around the VM stack
memoryWrapper *memoryWrapper // Wrapper around the VM memory
contractWrapper *contractWrapper // Wrapper around the contract object
dbWrapper *dbWrapper // Wrapper around the VM environment
pcValue *uint // Swappable pc value wrapped by a log accessor
gasValue *uint // Swappable gas value wrapped by a log accessor
costValue *uint // Swappable cost value wrapped by a log accessor
depthValue *uint // Swappable depth value wrapped by a log accessor
errorValue *string // Swappable error value wrapped by a log accessor
refundValue *uint // Swappable refund value wrapped by a log accessor
frame *frame // Represents entry into call frame. Fields are swappable
frameResult *frameResult // Represents exit from a call frame. Fields are swappable
ctx map[string]interface{} // Transaction context gathered throughout execution
err error // Error, if one has occurred
interrupt uint32 // Atomic flag to signal execution interruption
reason error // Textual reason for the interruption
activePrecompiles []common.Address // Updated on CaptureStart based on given rules
traceSteps bool // When true, will invoke step() on each opcode
traceCallFrames bool // When true, will invoke enter() and exit() js funcs
}
// New instantiates a new tracer instance. code specifies a Javascript snippet,
// which must evaluate to an expression returning an object with 'step', 'fault'
// and 'result' functions.
func newJsTracer(code string, ctx *tracers2.Context) (tracers2.Tracer, error) {
if c, ok := assetTracers[code]; ok {
code = c
}
if ctx == nil {
ctx = new(tracers2.Context)
}
tracer := &jsTracer{
vm: duktape.New(),
ctx: make(map[string]interface{}),
opWrapper: new(opWrapper),
stackWrapper: new(stackWrapper),
memoryWrapper: new(memoryWrapper),
contractWrapper: new(contractWrapper),
dbWrapper: new(dbWrapper),
pcValue: new(uint),
gasValue: new(uint),
costValue: new(uint),
depthValue: new(uint),
refundValue: new(uint),
frame: newFrame(),
frameResult: newFrameResult(),
}
if ctx.BlockHash != (common.Hash{}) {
tracer.ctx["blockHash"] = ctx.BlockHash
if ctx.TxHash != (common.Hash{}) {
tracer.ctx["txIndex"] = ctx.TxIndex
tracer.ctx["txHash"] = ctx.TxHash
}
}
// Set up builtins for this environment
tracer.vm.PushGlobalGoFunction("toHex", func(ctx *duktape.Context) int {
ctx.PushString(hexutil.Encode(popSlice(ctx)))
return 1
})
tracer.vm.PushGlobalGoFunction("toWord", func(ctx *duktape.Context) int {
var word common.Hash
if ptr, size := ctx.GetBuffer(-1); ptr != nil {
word = common.BytesToHash(makeSlice(ptr, size))
} else {
word = common.HexToHash(ctx.GetString(-1))
}
ctx.Pop()
copy(makeSlice(ctx.PushFixedBuffer(32), 32), word[:])
return 1
})
tracer.vm.PushGlobalGoFunction("toAddress", func(ctx *duktape.Context) int {
var addr common.Address
if ptr, size := ctx.GetBuffer(-1); ptr != nil {
addr = common.BytesToAddress(makeSlice(ptr, size))
} else {
addr = common.HexToAddress(ctx.GetString(-1))
}
ctx.Pop()
copy(makeSlice(ctx.PushFixedBuffer(20), 20), addr[:])
return 1
})
tracer.vm.PushGlobalGoFunction("toContract", func(ctx *duktape.Context) int {
var from common.Address
if ptr, size := ctx.GetBuffer(-2); ptr != nil {
from = common.BytesToAddress(makeSlice(ptr, size))
} else {
from = common.HexToAddress(ctx.GetString(-2))
}
nonce := uint64(ctx.GetInt(-1))
ctx.Pop2()
contract := crypto.CreateAddress(from, nonce)
copy(makeSlice(ctx.PushFixedBuffer(20), 20), contract[:])
return 1
})
tracer.vm.PushGlobalGoFunction("toContract2", func(ctx *duktape.Context) int {
var from common.Address
if ptr, size := ctx.GetBuffer(-3); ptr != nil {
from = common.BytesToAddress(makeSlice(ptr, size))
} else {
from = common.HexToAddress(ctx.GetString(-3))
}
// Retrieve salt hex string from js stack
salt := common.HexToHash(ctx.GetString(-2))
// Retrieve code slice from js stack
var code []byte
if ptr, size := ctx.GetBuffer(-1); ptr != nil {
code = common.CopyBytes(makeSlice(ptr, size))
} else {
code = common.FromHex(ctx.GetString(-1))
}
codeHash := crypto.Keccak256(code)
ctx.Pop3()
contract := crypto.CreateAddress2(from, salt, codeHash)
copy(makeSlice(ctx.PushFixedBuffer(20), 20), contract[:])
return 1
})
tracer.vm.PushGlobalGoFunction("isPrecompiled", func(ctx *duktape.Context) int {
addr := common.BytesToAddress(popSlice(ctx))
for _, p := range tracer.activePrecompiles {
if p == addr {
ctx.PushBoolean(true)
return 1
}
}
ctx.PushBoolean(false)
return 1
})
tracer.vm.PushGlobalGoFunction("slice", func(ctx *duktape.Context) int {
start, end := ctx.GetInt(-2), ctx.GetInt(-1)
ctx.Pop2()
blob := popSlice(ctx)
size := end - start
if start < 0 || start > end || end > len(blob) {
// TODO(karalabe): We can't js-throw from Go inside duktape inside Go. The Go
// runtime goes belly up https://github.com/golang/go/issues/15639.
log.Warn("Tracer accessed out of bound memory", "available", len(blob), "offset", start, "size", size)
ctx.PushFixedBuffer(0)
return 1
}
copy(makeSlice(ctx.PushFixedBuffer(size), uint(size)), blob[start:end])
return 1
})
// Push the JavaScript tracer as object #0 onto the JSVM stack and validate it
if err := tracer.vm.PevalString("(" + code + ")"); err != nil {
log.Warn("Failed to compile tracer", "err", err)
return nil, err
}
tracer.tracerObject = 0 // yeah, nice, eval can't return the index itself
hasStep := tracer.vm.GetPropString(tracer.tracerObject, "step")
tracer.vm.Pop()
if !tracer.vm.GetPropString(tracer.tracerObject, "fault") {
return nil, fmt.Errorf("trace object must expose a function fault()")
}
tracer.vm.Pop()
if !tracer.vm.GetPropString(tracer.tracerObject, "result") {
return nil, fmt.Errorf("trace object must expose a function result()")
}
tracer.vm.Pop()
hasEnter := tracer.vm.GetPropString(tracer.tracerObject, "enter")
tracer.vm.Pop()
hasExit := tracer.vm.GetPropString(tracer.tracerObject, "exit")
tracer.vm.Pop()
if hasEnter != hasExit {
return nil, fmt.Errorf("trace object must expose either both or none of enter() and exit()")
}
tracer.traceCallFrames = hasEnter && hasExit
tracer.traceSteps = hasStep
// Tracer is valid, inject the big int library to access large numbers
tracer.vm.EvalString(bigIntegerJS)
tracer.vm.PutGlobalString("bigInt")
// Push the global environment state as object #1 into the JSVM stack
tracer.stateObject = tracer.vm.PushObject()
logObject := tracer.vm.PushObject()
tracer.opWrapper.pushObject(tracer.vm)
tracer.vm.PutPropString(logObject, "op")
tracer.stackWrapper.pushObject(tracer.vm)
tracer.vm.PutPropString(logObject, "stack")
tracer.memoryWrapper.pushObject(tracer.vm)
tracer.vm.PutPropString(logObject, "memory")
tracer.contractWrapper.pushObject(tracer.vm)
tracer.vm.PutPropString(logObject, "contract")
tracer.vm.PushGoFunction(func(ctx *duktape.Context) int { ctx.PushUint(*tracer.pcValue); return 1 })
tracer.vm.PutPropString(logObject, "getPC")
tracer.vm.PushGoFunction(func(ctx *duktape.Context) int { ctx.PushUint(*tracer.gasValue); return 1 })
tracer.vm.PutPropString(logObject, "getGas")
tracer.vm.PushGoFunction(func(ctx *duktape.Context) int { ctx.PushUint(*tracer.costValue); return 1 })
tracer.vm.PutPropString(logObject, "getCost")
tracer.vm.PushGoFunction(func(ctx *duktape.Context) int { ctx.PushUint(*tracer.depthValue); return 1 })
tracer.vm.PutPropString(logObject, "getDepth")
tracer.vm.PushGoFunction(func(ctx *duktape.Context) int { ctx.PushUint(*tracer.refundValue); return 1 })
tracer.vm.PutPropString(logObject, "getRefund")
tracer.vm.PushGoFunction(func(ctx *duktape.Context) int {
if tracer.errorValue != nil {
ctx.PushString(*tracer.errorValue)
} else {
ctx.PushUndefined()
}
return 1
})
tracer.vm.PutPropString(logObject, "getError")
tracer.vm.PutPropString(tracer.stateObject, "log")
tracer.frame.pushObject(tracer.vm)
tracer.vm.PutPropString(tracer.stateObject, "frame")
tracer.frameResult.pushObject(tracer.vm)
tracer.vm.PutPropString(tracer.stateObject, "frameResult")
tracer.dbWrapper.pushObject(tracer.vm)
tracer.vm.PutPropString(tracer.stateObject, "db")
return tracer, nil
}
// Stop terminates execution of the tracer at the first opportune moment.
func (jst *jsTracer) Stop(err error) {
jst.reason = err
atomic.StoreUint32(&jst.interrupt, 1)
}
// call executes a method on a JS object, catching any errors, formatting and
// returning them as error objects.
func (jst *jsTracer) call(noret bool, method string, args ...string) (json.RawMessage, error) {
// Execute the JavaScript call and return any error
jst.vm.PushString(method)
for _, arg := range args {
jst.vm.GetPropString(jst.stateObject, arg)
}
code := jst.vm.PcallProp(jst.tracerObject, len(args))
defer jst.vm.Pop()
if code != 0 {
err := jst.vm.SafeToString(-1)
return nil, errors.New(err)
}
// No error occurred, extract return value and return
if noret {
return nil, nil
}
// Push a JSON marshaller onto the stack. We can't marshal from the out-
// side because duktape can crash on large nestings and we can't catch
// C++ exceptions ourselves from Go. TODO(karalabe): Yuck, why wrap?!
jst.vm.PushString("(JSON.stringify)")
jst.vm.Eval()
jst.vm.Swap(-1, -2)
if code = jst.vm.Pcall(1); code != 0 {
err := jst.vm.SafeToString(-1)
return nil, errors.New(err)
}
return json.RawMessage(jst.vm.SafeToString(-1)), nil
}
func wrapError(context string, err error) error {
return fmt.Errorf("%v in server-side tracer function '%v'", err, context)
}
// CaptureStart implements the Tracer interface to initialize the tracing operation.
func (jst *jsTracer) CaptureStart(env *vm.EVM, from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int) {
jst.env = env
jst.ctx["type"] = "CALL"
if create {
jst.ctx["type"] = "CREATE"
}
jst.ctx["from"] = from
jst.ctx["to"] = to
jst.ctx["input"] = input
jst.ctx["gas"] = gas
jst.ctx["gasPrice"] = env.TxContext.GasPrice
jst.ctx["value"] = value
// Initialize the context
jst.ctx["block"] = env.Context.BlockNumber.Uint64()
jst.dbWrapper.db = env.StateDB
// Update list of precompiles based on current block
rules := env.ChainConfig().Rules(env.Context.BlockNumber)
jst.activePrecompiles = vm.ActivePrecompiles(rules)
// Compute intrinsic gas
isHomestead := env.ChainConfig().IsHomestead(env.Context.BlockNumber)
isIstanbul := env.ChainConfig().IsIstanbul(env.Context.BlockNumber)
intrinsicGas, err := core.IntrinsicGas(input, nil, jst.ctx["type"] == "CREATE", isHomestead, isIstanbul)
if err != nil {
return
}
jst.ctx["intrinsicGas"] = intrinsicGas
}
// CaptureState implements the Tracer interface to trace a single step of VM execution.
func (jst *jsTracer) CaptureState(pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, rData []byte, depth int, err error) {
if !jst.traceSteps {
return
}
if jst.err != nil {
return
}
// If tracing was interrupted, set the error and stop
if atomic.LoadUint32(&jst.interrupt) > 0 {
jst.err = jst.reason
jst.env.Cancel()
return
}
jst.opWrapper.op = op
jst.stackWrapper.stack = scope.Stack
jst.memoryWrapper.memory = scope.Memory
jst.contractWrapper.contract = scope.Contract
*jst.pcValue = uint(pc)
*jst.gasValue = uint(gas)
*jst.costValue = uint(cost)
*jst.depthValue = uint(depth)
*jst.refundValue = uint(jst.env.StateDB.GetRefund())
jst.errorValue = nil
if err != nil {
jst.errorValue = new(string)
*jst.errorValue = err.Error()
}
if _, err := jst.call(true, "step", "log", "db"); err != nil {
jst.err = wrapError("step", err)
}
}
// CaptureFault implements the Tracer interface to trace an execution fault
func (jst *jsTracer) CaptureFault(pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, depth int, err error) {
if jst.err != nil {
return
}
// Apart from the error, everything matches the previous invocation
jst.errorValue = new(string)
*jst.errorValue = err.Error()
if _, err := jst.call(true, "fault", "log", "db"); err != nil {
jst.err = wrapError("fault", err)
}
}
// CaptureEnd is called after the call finishes to finalize the tracing.
func (jst *jsTracer) CaptureEnd(output []byte, gasUsed uint64, t time.Duration, err error) {
jst.ctx["output"] = output
jst.ctx["time"] = t.String()
jst.ctx["gasUsed"] = gasUsed
if err != nil {
jst.ctx["error"] = err.Error()
}
}
// CaptureEnter is called when EVM enters a new scope (via call, create or selfdestruct).
func (jst *jsTracer) CaptureEnter(typ vm.OpCode, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int) {
if !jst.traceCallFrames {
return
}
if jst.err != nil {
return
}
// If tracing was interrupted, set the error and stop
if atomic.LoadUint32(&jst.interrupt) > 0 {
jst.err = jst.reason
return
}
*jst.frame.typ = typ.String()
*jst.frame.from = from
*jst.frame.to = to
jst.frame.input = common.CopyBytes(input)
*jst.frame.gas = uint(gas)
jst.frame.value = nil
if value != nil {
jst.frame.value = new(big.Int).SetBytes(value.Bytes())
}
if _, err := jst.call(true, "enter", "frame"); err != nil {
jst.err = wrapError("enter", err)
}
}
// CaptureExit is called when EVM exits a scope, even if the scope didn't
// execute any code.
func (jst *jsTracer) CaptureExit(output []byte, gasUsed uint64, err error) {
if !jst.traceCallFrames {
return
}
// If tracing was interrupted, set the error and stop
if atomic.LoadUint32(&jst.interrupt) > 0 {
jst.err = jst.reason
return
}
jst.frameResult.output = common.CopyBytes(output)
*jst.frameResult.gasUsed = uint(gasUsed)
jst.frameResult.errorValue = nil
if err != nil {
jst.frameResult.errorValue = new(string)
*jst.frameResult.errorValue = err.Error()
}
if _, err := jst.call(true, "exit", "frameResult"); err != nil {
jst.err = wrapError("exit", err)
}
}
// GetResult calls the Javascript 'result' function and returns its value, or any accumulated error
func (jst *jsTracer) GetResult() (json.RawMessage, error) {
// Transform the context into a JavaScript object and inject into the state
obj := jst.vm.PushObject()
for key, val := range jst.ctx {
jst.addToObj(obj, key, val)
}
jst.vm.PutPropString(jst.stateObject, "ctx")
// Finalize the trace and return the results
result, err := jst.call(false, "result", "ctx", "db")
if err != nil {
jst.err = wrapError("result", err)
}
// Clean up the JavaScript environment
jst.vm.DestroyHeap()
jst.vm.Destroy()
return result, jst.err
}
// addToObj pushes a field to a JS object.
func (jst *jsTracer) addToObj(obj int, key string, val interface{}) {
pushValue(jst.vm, val)
jst.vm.PutPropString(obj, key)
}
func pushValue(ctx *duktape.Context, val interface{}) {
switch val := val.(type) {
case uint64:
ctx.PushUint(uint(val))
case string:
ctx.PushString(val)
case []byte:
ptr := ctx.PushFixedBuffer(len(val))
copy(makeSlice(ptr, uint(len(val))), val)
case common.Address:
ptr := ctx.PushFixedBuffer(20)
copy(makeSlice(ptr, 20), val[:])
case *big.Int:
pushBigInt(val, ctx)
case int:
ctx.PushInt(val)
case uint:
ctx.PushUint(val)
case common.Hash:
ptr := ctx.PushFixedBuffer(32)
copy(makeSlice(ptr, 32), val[:])
default:
panic(fmt.Sprintf("unsupported type: %T", val))
}
}
eth/tracers/tracer_test.go → eth/tracers/js/tracer_test.go
View file @ 6b9c77f0
......@@ -14,7 +14,7 @@
// 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 tracers
package js
import (
"encoding/json"
......@@ -26,6 +26,7 @@ import (
"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/eth/tracers"
"github.com/ethereum/go-ethereum/params"
)
......@@ -58,13 +59,13 @@ func testCtx() *vmContext {
return &vmContext{blockCtx: vm.BlockContext{BlockNumber: big.NewInt(1)}, txCtx: vm.TxContext{GasPrice: big.NewInt(100000)}}
}
func runTrace(tracer Tracer, vmctx *vmContext, chaincfg *params.ChainConfig) (json.RawMessage, error) {
env := vm.NewEVM(vmctx.blockCtx, vmctx.txCtx, &dummyStatedb{}, chaincfg, vm.Config{Debug: true, Tracer: tracer})
func runTrace(tracer tracers.Tracer, vmctx *vmContext, chaincfg *params.ChainConfig) (json.RawMessage, error) {
var (
env = vm.NewEVM(vmctx.blockCtx, vmctx.txCtx, &dummyStatedb{}, chaincfg, vm.Config{Debug: true, Tracer: tracer})
startGas uint64 = 10000
value = big.NewInt(0)
contract = vm.NewContract(account{}, account{}, value, startGas)
)
contract := vm.NewContract(account{}, account{}, value, startGas)
contract.Code = []byte{byte(vm.PUSH1), 0x1, byte(vm.PUSH1), 0x1, 0x0}
tracer.CaptureStart(env, contract.Caller(), contract.Address(), false, []byte{}, startGas, value)
......@@ -79,14 +80,11 @@ func runTrace(tracer Tracer, vmctx *vmContext, chaincfg *params.ChainConfig) (js
func TestTracer(t *testing.T) {
execTracer := func(code string) ([]byte, string) {
t.Helper()
tracer, err := New(code, new(Context))
tracer, err := newJsTracer(code, nil)
if err != nil {
t.Fatal(err)
}
ret, err := runTrace(tracer, &vmContext{
blockCtx: vm.BlockContext{BlockNumber: big.NewInt(1)},
txCtx: vm.TxContext{GasPrice: big.NewInt(100000)},
}, params.TestChainConfig)
ret, err := runTrace(tracer, testCtx(), params.TestChainConfig)
if err != nil {
return nil, err.Error() // Stringify to allow comparison without nil checks
}
......@@ -131,9 +129,8 @@ func TestTracer(t *testing.T) {
func TestHalt(t *testing.T) {
t.Skip("duktape doesn't support abortion")
timeout := errors.New("stahp")
tracer, err := New("{step: function() { while(1); }, result: function() { return null; }}", new(Context))
tracer, err := newJsTracer("{step: function() { while(1); }, result: function() { return null; }, fault: function(){}}", nil)
if err != nil {
t.Fatal(err)
}
......@@ -147,18 +144,19 @@ func TestHalt(t *testing.T) {
}
func TestHaltBetweenSteps(t *testing.T) {
tracer, err := New("{step: function() {}, fault: function() {}, result: function() { return null; }}", new(Context))
tracer, err := newJsTracer("{step: function() {}, fault: function() {}, result: function() { return null; }}", nil)
if err != nil {
t.Fatal(err)
}
env := vm.NewEVM(vm.BlockContext{BlockNumber: big.NewInt(1)}, vm.TxContext{}, &dummyStatedb{}, params.TestChainConfig, vm.Config{Debug: true, Tracer: tracer})
env := vm.NewEVM(vm.BlockContext{BlockNumber: big.NewInt(1)}, vm.TxContext{GasPrice: big.NewInt(1)}, &dummyStatedb{}, params.TestChainConfig, vm.Config{Debug: true, Tracer: tracer})
scope := &vm.ScopeContext{
Contract: vm.NewContract(&account{}, &account{}, big.NewInt(0), 0),
}
tracer.CaptureState(env, 0, 0, 0, 0, scope, nil, 0, nil)
tracer.CaptureStart(env, common.Address{}, common.Address{}, false, []byte{}, 0, big.NewInt(0))
tracer.CaptureState(0, 0, 0, 0, scope, nil, 0, nil)
timeout := errors.New("stahp")
tracer.Stop(timeout)
tracer.CaptureState(env, 0, 0, 0, 0, scope, nil, 0, nil)
tracer.CaptureState(0, 0, 0, 0, scope, nil, 0, nil)
if _, err := tracer.GetResult(); err.Error() != timeout.Error() {
t.Errorf("Expected timeout error, got %v", err)
......@@ -168,24 +166,16 @@ func TestHaltBetweenSteps(t *testing.T) {
// TestNoStepExec tests a regular value transfer (no exec), and accessing the statedb
// in 'result'
func TestNoStepExec(t *testing.T) {
runEmptyTrace := func(tracer Tracer, vmctx *vmContext) (json.RawMessage, error) {
env := vm.NewEVM(vmctx.blockCtx, vmctx.txCtx, &dummyStatedb{}, params.TestChainConfig, vm.Config{Debug: true, Tracer: tracer})
startGas := uint64(10000)
contract := vm.NewContract(account{}, account{}, big.NewInt(0), startGas)
tracer.CaptureStart(env, contract.Caller(), contract.Address(), false, []byte{}, startGas, big.NewInt(0))
tracer.CaptureEnd(nil, startGas-contract.Gas, 1, nil)
return tracer.GetResult()
}
execTracer := func(code string) []byte {
t.Helper()
tracer, err := New(code, new(Context))
tracer, err := newJsTracer(code, nil)
if err != nil {
t.Fatal(err)
}
ret, err := runEmptyTrace(tracer, &vmContext{
blockCtx: vm.BlockContext{BlockNumber: big.NewInt(1)},
txCtx: vm.TxContext{GasPrice: big.NewInt(100000)},
})
env := vm.NewEVM(vm.BlockContext{BlockNumber: big.NewInt(1)}, vm.TxContext{GasPrice: big.NewInt(100)}, &dummyStatedb{}, params.TestChainConfig, vm.Config{Debug: true, Tracer: tracer})
tracer.CaptureStart(env, common.Address{}, common.Address{}, false, []byte{}, 1000, big.NewInt(0))
tracer.CaptureEnd(nil, 0, 1, nil)
ret, err := tracer.GetResult()
if err != nil {
t.Fatal(err)
}
......@@ -212,7 +202,7 @@ func TestIsPrecompile(t *testing.T) {
chaincfg.IstanbulBlock = big.NewInt(200)
chaincfg.BerlinBlock = big.NewInt(300)
txCtx := vm.TxContext{GasPrice: big.NewInt(100000)}
tracer, err := New("{addr: toAddress('0000000000000000000000000000000000000009'), res: null, step: function() { this.res = isPrecompiled(this.addr); }, fault: function() {}, result: function() { return this.res; }}", new(Context))
tracer, err := newJsTracer("{addr: toAddress('0000000000000000000000000000000000000009'), res: null, step: function() { this.res = isPrecompiled(this.addr); }, fault: function() {}, result: function() { return this.res; }}", nil)
if err != nil {
t.Fatal(err)
}
......@@ -226,7 +216,7 @@ func TestIsPrecompile(t *testing.T) {
t.Errorf("Tracer should not consider blake2f as precompile in byzantium")
}
tracer, _ = New("{addr: toAddress('0000000000000000000000000000000000000009'), res: null, step: function() { this.res = isPrecompiled(this.addr); }, fault: function() {}, result: function() { return this.res; }}", new(Context))
tracer, _ = newJsTracer("{addr: toAddress('0000000000000000000000000000000000000009'), res: null, step: function() { this.res = isPrecompiled(this.addr); }, fault: function() {}, result: function() { return this.res; }}", nil)
blockCtx = vm.BlockContext{BlockNumber: big.NewInt(250)}
res, err = runTrace(tracer, &vmContext{blockCtx, txCtx}, chaincfg)
if err != nil {
......@@ -239,23 +229,20 @@ func TestIsPrecompile(t *testing.T) {
func TestEnterExit(t *testing.T) {
// test that either both or none of enter() and exit() are defined
if _, err := New("{step: function() {}, fault: function() {}, result: function() { return null; }, enter: function() {}}", new(Context)); err == nil {
if _, err := newJsTracer("{step: function() {}, fault: function() {}, result: function() { return null; }, enter: function() {}}", new(tracers.Context)); err == nil {
t.Fatal("tracer creation should've failed without exit() definition")
}
if _, err := New("{step: function() {}, fault: function() {}, result: function() { return null; }, enter: function() {}, exit: function() {}}", new(Context)); err != nil {
if _, err := newJsTracer("{step: function() {}, fault: function() {}, result: function() { return null; }, enter: function() {}, exit: function() {}}", new(tracers.Context)); err != nil {
t.Fatal(err)
}
// test that the enter and exit method are correctly invoked and the values passed
tracer, err := New("{enters: 0, exits: 0, enterGas: 0, gasUsed: 0, step: function() {}, fault: function() {}, result: function() { return {enters: this.enters, exits: this.exits, enterGas: this.enterGas, gasUsed: this.gasUsed} }, enter: function(frame) { this.enters++; this.enterGas = frame.getGas(); }, exit: function(res) { this.exits++; this.gasUsed = res.getGasUsed(); }}", new(Context))
tracer, err := newJsTracer("{enters: 0, exits: 0, enterGas: 0, gasUsed: 0, step: function() {}, fault: function() {}, result: function() { return {enters: this.enters, exits: this.exits, enterGas: this.enterGas, gasUsed: this.gasUsed} }, enter: function(frame) { this.enters++; this.enterGas = frame.getGas(); }, exit: function(res) { this.exits++; this.gasUsed = res.getGasUsed(); }}", new(tracers.Context))
if err != nil {
t.Fatal(err)
}
scope := &vm.ScopeContext{
Contract: vm.NewContract(&account{}, &account{}, big.NewInt(0), 0),
}
tracer.CaptureEnter(vm.CALL, scope.Contract.Caller(), scope.Contract.Address(), []byte{}, 1000, new(big.Int))
tracer.CaptureExit([]byte{}, 400, nil)
......
eth/tracers/native/call.go
View file @ 6b9c77f0
......@@ -31,7 +31,7 @@ import (
)
func init() {
tracers.RegisterNativeTracer("callTracer", NewCallTracer)
register("callTracer", newCallTracer)
}
type callFrame struct {
......@@ -48,21 +48,24 @@ type callFrame struct {
}
type callTracer struct {
env *vm.EVM
callstack []callFrame
interrupt uint32 // Atomic flag to signal execution interruption
reason error // Textual reason for the interruption
}
// NewCallTracer returns a native go tracer which tracks
// newCallTracer returns a native go tracer which tracks
// call frames of a tx, and implements vm.EVMLogger.
func NewCallTracer() tracers.Tracer {
func newCallTracer() tracers.Tracer {
// First callframe contains tx context info
// and is populated on start and end.
t := &callTracer{callstack: make([]callFrame, 1)}
return t
}
// CaptureStart implements the EVMLogger interface to initialize the tracing operation.
func (t *callTracer) CaptureStart(env *vm.EVM, from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int) {
t.env = env
t.callstack[0] = callFrame{
Type: "CALL",
From: addrToHex(from),
......@@ -76,6 +79,7 @@ func (t *callTracer) CaptureStart(env *vm.EVM, from common.Address, to common.Ad
}
}
// CaptureEnd is called after the call finishes to finalize the tracing.
func (t *callTracer) CaptureEnd(output []byte, gasUsed uint64, _ time.Duration, err error) {
t.callstack[0].GasUsed = uintToHex(gasUsed)
if err != nil {
......@@ -88,16 +92,19 @@ func (t *callTracer) CaptureEnd(output []byte, gasUsed uint64, _ time.Duration,
}
}
func (t *callTracer) CaptureState(env *vm.EVM, pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, rData []byte, depth int, err error) {
// CaptureState implements the EVMLogger interface to trace a single step of VM execution.
func (t *callTracer) CaptureState(pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, rData []byte, depth int, err error) {
}
func (t *callTracer) CaptureFault(env *vm.EVM, pc uint64, op vm.OpCode, gas, cost uint64, _ *vm.ScopeContext, depth int, err error) {
// CaptureFault implements the EVMLogger interface to trace an execution fault.
func (t *callTracer) CaptureFault(pc uint64, op vm.OpCode, gas, cost uint64, _ *vm.ScopeContext, depth int, err error) {
}
// CaptureEnter is called when EVM enters a new scope (via call, create or selfdestruct).
func (t *callTracer) CaptureEnter(typ vm.OpCode, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int) {
// Skip if tracing was interrupted
if atomic.LoadUint32(&t.interrupt) > 0 {
// TODO: env.Cancel()
t.env.Cancel()
return
}
......@@ -112,6 +119,8 @@ func (t *callTracer) CaptureEnter(typ vm.OpCode, from common.Address, to common.
t.callstack = append(t.callstack, call)
}
// CaptureExit is called when EVM exits a scope, even if the scope didn't
// execute any code.
func (t *callTracer) CaptureExit(output []byte, gasUsed uint64, err error) {
size := len(t.callstack)
if size <= 1 {
......@@ -134,6 +143,8 @@ func (t *callTracer) CaptureExit(output []byte, gasUsed uint64, err error) {
t.callstack[size-1].Calls = append(t.callstack[size-1].Calls, call)
}
// GetResult returns the json-encoded nested list of call traces, and any
// error arising from the encoding or forceful termination (via `Stop`).
func (t *callTracer) GetResult() (json.RawMessage, error) {
if len(t.callstack) != 1 {
return nil, errors.New("incorrect number of top-level calls")
......@@ -145,6 +156,7 @@ func (t *callTracer) GetResult() (json.RawMessage, error) {
return json.RawMessage(res), t.reason
}
// Stop terminates execution of the tracer at the first opportune moment.
func (t *callTracer) Stop(err error) {
t.reason = err
atomic.StoreUint32(&t.interrupt, 1)
......
eth/tracers/native/noop.go
View file @ 6b9c77f0
// Copyright 2021 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 native
import (
......@@ -11,36 +27,48 @@ import (
)
func init() {
tracers.RegisterNativeTracer("noopTracerNative", NewNoopTracer)
register("noopTracerNative", newNoopTracer)
}
// noopTracer is a go implementation of the Tracer interface which
// performs no action. It's mostly useful for testing purposes.
type noopTracer struct{}
func NewNoopTracer() tracers.Tracer {
// newNoopTracer returns a new noop tracer.
func newNoopTracer() tracers.Tracer {
return &noopTracer{}
}
// CaptureStart implements the EVMLogger interface to initialize the tracing operation.
func (t *noopTracer) CaptureStart(env *vm.EVM, from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int) {
}
// CaptureEnd is called after the call finishes to finalize the tracing.
func (t *noopTracer) CaptureEnd(output []byte, gasUsed uint64, _ time.Duration, err error) {
}
func (t *noopTracer) CaptureState(env *vm.EVM, pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, rData []byte, depth int, err error) {
// CaptureState implements the EVMLogger interface to trace a single step of VM execution.
func (t *noopTracer) CaptureState(pc uint64, op vm.OpCode, gas, cost uint64, scope *vm.ScopeContext, rData []byte, depth int, err error) {
}
func (t *noopTracer) CaptureFault(env *vm.EVM, pc uint64, op vm.OpCode, gas, cost uint64, _ *vm.ScopeContext, depth int, err error) {
// CaptureFault implements the EVMLogger interface to trace an execution fault.
func (t *noopTracer) CaptureFault(pc uint64, op vm.OpCode, gas, cost uint64, _ *vm.ScopeContext, depth int, err error) {
}
// CaptureEnter is called when EVM enters a new scope (via call, create or selfdestruct).
func (t *noopTracer) CaptureEnter(typ vm.OpCode, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int) {
}
// CaptureExit is called when EVM exits a scope, even if the scope didn't
// execute any code.
func (t *noopTracer) CaptureExit(output []byte, gasUsed uint64, err error) {
}
// GetResult returns an empty json object.
func (t *noopTracer) GetResult() (json.RawMessage, error) {
return json.RawMessage(`{}`), nil
}
// Stop terminates execution of the tracer at the first opportune moment.
func (t *noopTracer) Stop(err error) {
}
eth/tracers/native/tracer.go 0 → 100644
View file @ 6b9c77f0
// Copyright 2021 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 native is a collection of tracers written in go.
In order to add a native tracer and have it compiled into the binary, a new
file needs to be added to this folder, containing an implementation of the
`eth.tracers.Tracer` interface.
Aside from implementing the tracer, it also needs to register itself, using the
`register` method -- and this needs to be done in the package initialization.
Example:
```golang
func init() {
register("noopTracerNative", newNoopTracer)
}
```
*/
package native
import (
"errors"
"github.com/ethereum/go-ethereum/eth/tracers"
)
// init registers itself this packages as a lookup for tracers.
func init() {
tracers.RegisterLookup(false, lookup)
}
/*
ctors is a map of package-local tracer constructors.
We cannot be certain about the order of init-functions within a package,
The go spec (https://golang.org/ref/spec#Package_initialization) says
> To ensure reproducible initialization behavior, build systems
> are encouraged to present multiple files belonging to the same
> package in lexical file name order to a compiler.
Hence, we cannot make the map in init, but must make it upon first use.
*/
var ctors map[string]func() tracers.Tracer
// register is used by native tracers to register their presence.
func register(name string, ctor func() tracers.Tracer) {
if ctors == nil {
ctors = make(map[string]func() tracers.Tracer)
}
ctors[name] = ctor
}
// lookup returns a tracer, if one can be matched to the given name.
func lookup(name string, ctx *tracers.Context) (tracers.Tracer, error) {
if ctors == nil {
ctors = make(map[string]func() tracers.Tracer)
}
if ctor, ok := ctors[name]; ok {
return ctor(), nil
}
return nil, errors.New("no tracer found")
}
eth/tracers/tracers.go
View file @ 6b9c77f0
......@@ -14,18 +14,25 @@
// 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 tracers is a collection of JavaScript transaction tracers.
// Package tracers is a manager for transaction tracing engines.
package tracers
import (
"encoding/json"
"strings"
"unicode"
"errors"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/eth/tracers/internal/tracers"
)
// Context contains some contextual infos for a transaction execution that is not
// available from within the EVM object.
type Context struct {
BlockHash common.Hash // Hash of the block the tx is contained within (zero if dangling tx or call)
TxIndex int // Index of the transaction within a block (zero if dangling tx or call)
TxHash common.Hash // Hash of the transaction being traced (zero if dangling call)
}
// Tracer interface extends vm.EVMLogger and additionally
// allows collecting the tracing result.
type Tracer interface {
......@@ -35,50 +42,31 @@ type Tracer interface {
Stop(err error)
}
type lookupFunc func(string, *Context) (Tracer, error)
var (
nativeTracers map[string]func() Tracer = make(map[string]func() Tracer)
jsTracers = make(map[string]string)
lookups []lookupFunc
)
// RegisterNativeTracer makes native tracers which adhere
// to the `Tracer` interface available to the rest of the codebase.
// It is typically invoked in the `init()` function, e.g. see the `native/call.go`.
func RegisterNativeTracer(name string, ctor func() Tracer) {
nativeTracers[name] = ctor
}
// New returns a new instance of a tracer,
// 1. If 'code' is the name of a registered native tracer, then that tracer
// is instantiated and returned
// 2. If 'code' is the name of a registered js-tracer, then that tracer is
// instantiated and returned
// 3. Otherwise, the code is interpreted as the js code of a js-tracer, and
// is evaluated and returned.
func New(code string, ctx *Context) (Tracer, error) {
// Resolve native tracer
if fn, ok := nativeTracers[code]; ok {
return fn(), nil
}
// Resolve js-tracers by name and assemble the tracer object
if tracer, ok := jsTracers[code]; ok {
code = tracer
// RegisterLookup registers a method as a lookup for tracers, meaning that
// users can invoke a named tracer through that lookup. If 'wildcard' is true,
// then the lookup will be placed last. This is typically meant for interpreted
// engines (js) which can evaluate dynamic user-supplied code.
func RegisterLookup(wildcard bool, lookup lookupFunc) {
if wildcard {
lookups = append(lookups, lookup)
} else {
lookups = append([]lookupFunc{lookup}, lookups...)
}
return newJsTracer(code, ctx)
}
// camel converts a snake cased input string into a camel cased output.
func camel(str string) string {
pieces := strings.Split(str, "_")
for i := 1; i < len(pieces); i++ {
pieces[i] = string(unicode.ToUpper(rune(pieces[i][0]))) + pieces[i][1:]
// New returns a new instance of a tracer, by iterating through the
// registered lookups.
func New(code string, ctx *Context) (Tracer, error) {
for _, lookup := range lookups {
if tracer, err := lookup(code, ctx); err == nil {
return tracer, nil
}
return strings.Join(pieces, "")
}
// init retrieves the JavaScript transaction tracers included in go-ethereum.
func init() {
for _, file := range tracers.AssetNames() {
name := camel(strings.TrimSuffix(file, ".js"))
jsTracers[name] = string(tracers.MustAsset(file))
}
return nil, errors.New("tracer not found")
}
eth/tracers/tracers_test.go
View file @ 6b9c77f0
......@@ -17,11 +17,7 @@
package tracers
import (
"crypto/ecdsa"
"crypto/rand"
"encoding/json"
"math/big"
"reflect"
"testing"
"github.com/ethereum/go-ethereum/common"
......@@ -35,56 +31,6 @@ import (
"github.com/ethereum/go-ethereum/tests"
)
// To generate a new callTracer test, copy paste the makeTest method below into
// a Geth console and call it with a transaction hash you which to export.
/*
// makeTest generates a callTracer test by running a prestate reassembled and a
// call trace run, assembling all the gathered information into a test case.
var makeTest = function(tx, rewind) {
// Generate the genesis block from the block, transaction and prestate data
var block = eth.getBlock(eth.getTransaction(tx).blockHash);
var genesis = eth.getBlock(block.parentHash);
delete genesis.gasUsed;
delete genesis.logsBloom;
delete genesis.parentHash;
delete genesis.receiptsRoot;
delete genesis.sha3Uncles;
delete genesis.size;
delete genesis.transactions;
delete genesis.transactionsRoot;
delete genesis.uncles;
genesis.gasLimit = genesis.gasLimit.toString();
genesis.number = genesis.number.toString();
genesis.timestamp = genesis.timestamp.toString();
genesis.alloc = debug.traceTransaction(tx, {tracer: "prestateTracer", rewind: rewind});
for (var key in genesis.alloc) {
genesis.alloc[key].nonce = genesis.alloc[key].nonce.toString();
}
genesis.config = admin.nodeInfo.protocols.eth.config;
// Generate the call trace and produce the test input
var result = debug.traceTransaction(tx, {tracer: "callTracer", rewind: rewind});
delete result.time;
console.log(JSON.stringify({
genesis: genesis,
context: {
number: block.number.toString(),
difficulty: block.difficulty,
timestamp: block.timestamp.toString(),
gasLimit: block.gasLimit.toString(),
miner: block.miner,
},
input: eth.getRawTransaction(tx),
result: result,
}, null, 2));
}
*/
// callTrace is the result of a callTracer run.
type callTrace struct {
Type string `json:"type"`
......@@ -99,184 +45,6 @@ type callTrace struct {
Calls []callTrace `json:"calls,omitempty"`
}
// TestZeroValueToNotExitCall tests the calltracer(s) on the following:
// Tx to A, A calls B with zero value. B does not already exist.
// Expected: that enter/exit is invoked and the inner call is shown in the result
func TestZeroValueToNotExitCall(t *testing.T) {
var to = common.HexToAddress("0x00000000000000000000000000000000deadbeef")
privkey, err := crypto.HexToECDSA("0000000000000000deadbeef00000000000000000000000000000000deadbeef")
if err != nil {
t.Fatalf("err %v", err)
}
signer := types.NewEIP155Signer(big.NewInt(1))
tx, err := types.SignNewTx(privkey, signer, &types.LegacyTx{
GasPrice: big.NewInt(0),
Gas: 50000,
To: &to,
})
if err != nil {
t.Fatalf("err %v", err)
}
origin, _ := signer.Sender(tx)
txContext := vm.TxContext{
Origin: origin,
GasPrice: big.NewInt(1),
}
context := vm.BlockContext{
CanTransfer: core.CanTransfer,
Transfer: core.Transfer,
Coinbase: common.Address{},
BlockNumber: new(big.Int).SetUint64(8000000),
Time: new(big.Int).SetUint64(5),
Difficulty: big.NewInt(0x30000),
GasLimit: uint64(6000000),
}
var code = []byte{
byte(vm.PUSH1), 0x0, byte(vm.DUP1), byte(vm.DUP1), byte(vm.DUP1), // in and outs zero
byte(vm.DUP1), byte(vm.PUSH1), 0xff, byte(vm.GAS), // value=0,address=0xff, gas=GAS
byte(vm.CALL),
}
var alloc = core.GenesisAlloc{
to: core.GenesisAccount{
Nonce: 1,
Code: code,
},
origin: core.GenesisAccount{
Nonce: 0,
Balance: big.NewInt(500000000000000),
},
}
_, statedb := tests.MakePreState(rawdb.NewMemoryDatabase(), alloc, false)
// Create the tracer, the EVM environment and run it
tracer, err := New("callTracerJs", new(Context))
if err != nil {
t.Fatalf("failed to create call tracer: %v", err)
}
evm := vm.NewEVM(context, txContext, statedb, params.MainnetChainConfig, vm.Config{Debug: true, Tracer: tracer})
msg, err := tx.AsMessage(signer, nil)
if err != nil {
t.Fatalf("failed to prepare transaction for tracing: %v", err)
}
st := core.NewStateTransition(evm, msg, new(core.GasPool).AddGas(tx.Gas()))
if _, err = st.TransitionDb(); err != nil {
t.Fatalf("failed to execute transaction: %v", err)
}
// Retrieve the trace result and compare against the etalon
res, err := tracer.GetResult()
if err != nil {
t.Fatalf("failed to retrieve trace result: %v", err)
}
have := new(callTrace)
if err := json.Unmarshal(res, have); err != nil {
t.Fatalf("failed to unmarshal trace result: %v", err)
}
wantStr := `{"type":"CALL","from":"0x682a80a6f560eec50d54e63cbeda1c324c5f8d1b","to":"0x00000000000000000000000000000000deadbeef","value":"0x0","gas":"0x7148","gasUsed":"0x2d0","input":"0x","output":"0x","calls":[{"type":"CALL","from":"0x00000000000000000000000000000000deadbeef","to":"0x00000000000000000000000000000000000000ff","value":"0x0","gas":"0x6cbf","gasUsed":"0x0","input":"0x","output":"0x"}]}`
want := new(callTrace)
json.Unmarshal([]byte(wantStr), want)
if !jsonEqual(have, want) {
t.Error("have != want")
}
}
func TestPrestateTracerCreate2(t *testing.T) {
unsignedTx := types.NewTransaction(1, common.HexToAddress("0x00000000000000000000000000000000deadbeef"),
new(big.Int), 5000000, big.NewInt(1), []byte{})
privateKeyECDSA, err := ecdsa.GenerateKey(crypto.S256(), rand.Reader)
if err != nil {
t.Fatalf("err %v", err)
}
signer := types.NewEIP155Signer(big.NewInt(1))
tx, err := types.SignTx(unsignedTx, signer, privateKeyECDSA)
if err != nil {
t.Fatalf("err %v", err)
}
/**
This comes from one of the test-vectors on the Skinny Create2 - EIP
address 0x00000000000000000000000000000000deadbeef
salt 0x00000000000000000000000000000000000000000000000000000000cafebabe
init_code 0xdeadbeef
gas (assuming no mem expansion): 32006
result: 0x60f3f640a8508fC6a86d45DF051962668E1e8AC7
*/
origin, _ := signer.Sender(tx)
txContext := vm.TxContext{
Origin: origin,
GasPrice: big.NewInt(1),
}
context := vm.BlockContext{
CanTransfer: core.CanTransfer,
Transfer: core.Transfer,
Coinbase: common.Address{},
BlockNumber: new(big.Int).SetUint64(8000000),
Time: new(big.Int).SetUint64(5),
Difficulty: big.NewInt(0x30000),
GasLimit: uint64(6000000),
}
alloc := core.GenesisAlloc{}
// The code pushes 'deadbeef' into memory, then the other params, and calls CREATE2, then returns
// the address
alloc[common.HexToAddress("0x00000000000000000000000000000000deadbeef")] = core.GenesisAccount{
Nonce: 1,
Code: hexutil.MustDecode("0x63deadbeef60005263cafebabe6004601c6000F560005260206000F3"),
Balance: big.NewInt(1),
}
alloc[origin] = core.GenesisAccount{
Nonce: 1,
Code: []byte{},
Balance: big.NewInt(500000000000000),
}
_, statedb := tests.MakePreState(rawdb.NewMemoryDatabase(), alloc, false)
// Create the tracer, the EVM environment and run it
tracer, err := New("prestateTracer", new(Context))
if err != nil {
t.Fatalf("failed to create call tracer: %v", err)
}
evm := vm.NewEVM(context, txContext, statedb, params.MainnetChainConfig, vm.Config{Debug: true, Tracer: tracer})
msg, err := tx.AsMessage(signer, nil)
if err != nil {
t.Fatalf("failed to prepare transaction for tracing: %v", err)
}
st := core.NewStateTransition(evm, msg, new(core.GasPool).AddGas(tx.Gas()))
if _, err = st.TransitionDb(); err != nil {
t.Fatalf("failed to execute transaction: %v", err)
}
// Retrieve the trace result and compare against the etalon
res, err := tracer.GetResult()
if err != nil {
t.Fatalf("failed to retrieve trace result: %v", err)
}
ret := make(map[string]interface{})
if err := json.Unmarshal(res, &ret); err != nil {
t.Fatalf("failed to unmarshal trace result: %v", err)
}
if _, has := ret["0x60f3f640a8508fc6a86d45df051962668e1e8ac7"]; !has {
t.Fatalf("Expected 0x60f3f640a8508fc6a86d45df051962668e1e8ac7 in result")
}
}
// jsonEqual is similar to reflect.DeepEqual, but does a 'bounce' via json prior to
// comparison
func jsonEqual(x, y interface{}) bool {
xTrace := new(callTrace)
yTrace := new(callTrace)
if xj, err := json.Marshal(x); err == nil {
json.Unmarshal(xj, xTrace)
} else {
return false
}
if yj, err := json.Marshal(y); err == nil {
json.Unmarshal(yj, yTrace)
} else {
return false
}
return reflect.DeepEqual(xTrace, yTrace)
}
func BenchmarkTransactionTrace(b *testing.B) {
key, _ := crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
from := crypto.PubkeyToAddress(key.PublicKey)
......
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