eth/tracers: various fixes #30540 (#1491)

Breaking changes:

- The ChainConfig was exposed to tracers via VMContext passed in
`OnTxStart`. This is unnecessary specially looking through the lens of
live tracers as chain config remains the same throughout the lifetime of
the program. It was there so that native API-invoked tracers could
access it. So instead we moved it to the constructor of API tracers.

Non-breaking:

- Change the default config of the tracers to be `{}` instead of nil.
This way an extra nil check can be avoided.

Refactoring:

- Rename `supply` struct to `supplyTracer`.
- Un-export some hook definitions.

Co-authored-by: Sina M <1591639+s1na@users.noreply.github.com>

cmd/utils/flags.go

@@ -384,6 +384,7 @@ var (
 	VMTraceJsonConfigFlag = &cli.StringFlag{
 		Name:     "vmtrace-config",
 		Usage:    "Tracer configuration (JSON)",
+		Value:    "{}",
 		Category: flags.VMCategory,
 	}
 
@@ -1673,13 +1674,8 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *ethconfig.Config) {
 	// VM tracing config.
 	if ctx.IsSet(VMTraceFlag.Name) {
 		if name := ctx.String(VMTraceFlag.Name); name != "" {
-			var config string
-			if ctx.IsSet(VMTraceJsonConfigFlag.Name) {
-				config = ctx.String(VMTraceJsonConfigFlag.Name)
-			}
-
 			cfg.VMTrace = name
-			cfg.VMTraceJsonConfig = config
+			cfg.VMTraceJsonConfig = ctx.String(VMTraceJsonConfigFlag.Name)
 		}
 	}
 }
@@ -1862,10 +1858,7 @@ func MakeChain(ctx *cli.Context, stack *node.Node, readonly bool) (chain *core.B
 	vmcfg := vm.Config{EnablePreimageRecording: ctx.Bool(VMEnableDebugFlag.Name)}
 	if ctx.IsSet(VMTraceFlag.Name) {
 		if name := ctx.String(VMTraceFlag.Name); name != "" {
-			var config json.RawMessage
+			config := json.RawMessage(ctx.String(VMTraceJsonConfigFlag.Name))
-			if ctx.IsSet(VMTraceJsonConfigFlag.Name) {
-				config = json.RawMessage(ctx.String(VMTraceJsonConfigFlag.Name))
-			}
 			t, err := tracers.LiveDirectory.New(name, config)
 			if err != nil {
 				Fatalf("Failed to create tracer %q: %v", name, err)

core/tracing/hooks.go

@@ -53,9 +53,8 @@ type VMContext struct {
 	Time        uint64
 	Random      *common.Hash
 	// Effective tx gas price
-	GasPrice    *big.Int
+	GasPrice *big.Int
-	ChainConfig *params.ChainConfig
+	StateDB  StateDB
-	StateDB     StateDB
 }
 
 // BlockEvent is emitted upon tracing an incoming block.

core/vm/evm.go

@@ -557,7 +557,6 @@ func (evm *EVM) GetVMContext() *tracing.VMContext {
 		Time:        evm.Context.Time,
 		Random:      evm.Context.Random,
 		GasPrice:    evm.TxContext.GasPrice,
-		ChainConfig: evm.ChainConfig(),
 		StateDB:     evm.StateDB,
 	}
 }

core/vm/runtime/runtime_test.go

@@ -828,7 +828,7 @@ func TestRuntimeJSTracer(t *testing.T) {
 			statedb.SetCode(common.HexToAddress("0xee"), calleeCode)
 			statedb.SetCode(common.HexToAddress("0xff"), suicideCode)
 
-			tracer, err := tracers.DefaultDirectory.New(jsTracer, new(tracers.Context), nil)
+			tracer, err := tracers.DefaultDirectory.New(jsTracer, new(tracers.Context), nil, params.TestChainConfig)
 			if err != nil {
 				t.Fatal(err)
 			}
@@ -863,7 +863,7 @@ func TestJSTracerCreateTx(t *testing.T) {
 	code := []byte{byte(vm.PUSH1), 0, byte(vm.PUSH1), 0, byte(vm.RETURN)}
 
 	statedb, _ := state.New(types.EmptyRootHash, state.NewDatabase(rawdb.NewMemoryDatabase()))
-	tracer, err := tracers.DefaultDirectory.New(jsTracer, new(tracers.Context), nil)
+	tracer, err := tracers.DefaultDirectory.New(jsTracer, new(tracers.Context), nil, params.TestChainConfig)
 	if err != nil {
 		t.Fatal(err)
 	}

eth/backend.go

@@ -187,7 +187,7 @@ func New(stack *node.Node, config *ethconfig.Config, XDCXServ *XDCx.XDCX, lendin
 		}
 	)
 	if config.VMTrace != "" {
-		var traceConfig json.RawMessage
+		traceConfig := json.RawMessage("{}")
 		if config.VMTraceJsonConfig != "" {
 			traceConfig = json.RawMessage(config.VMTraceJsonConfig)
 		}

eth/tracers/api.go

@@ -856,7 +856,7 @@ func (api *API) traceTx(ctx context.Context, tx *types.Transaction, message *cor
 			Stop:      logger.Stop,
 		}
 	} else {
-		tracer, err = DefaultDirectory.New(*config.Tracer, txctx, config.TracerConfig)
+		tracer, err = DefaultDirectory.New(*config.Tracer, txctx, config.TracerConfig, api.backend.ChainConfig())
 		if err != nil {
 			return nil, err
 		}

eth/tracers/dir.go

@@ -22,6 +22,7 @@ import (
 
 	"github.com/XinFinOrg/XDPoSChain/common"
 	"github.com/XinFinOrg/XDPoSChain/core/tracing"
+	"github.com/XinFinOrg/XDPoSChain/params"
 )
 
 // Context contains some contextual infos for a transaction execution that is not
@@ -44,8 +45,8 @@ type Tracer struct {
 	Stop func(err error)
 }
 
-type ctorFn func(*Context, json.RawMessage) (*Tracer, error)
+type ctorFn func(*Context, json.RawMessage, *params.ChainConfig) (*Tracer, error)
-type jsCtorFn func(string, *Context, json.RawMessage) (*Tracer, error)
+type jsCtorFn func(string, *Context, json.RawMessage, *params.ChainConfig) (*Tracer, error)
 
 type elem struct {
 	ctor ctorFn
@@ -78,12 +79,15 @@ func (d *directory) RegisterJSEval(f jsCtorFn) {
 // New returns a new instance of a tracer, by iterating through the
 // registered lookups. Name is either name of an existing tracer
 // or an arbitrary JS code.
-func (d *directory) New(name string, ctx *Context, cfg json.RawMessage) (*Tracer, error) {
+func (d *directory) New(name string, ctx *Context, cfg json.RawMessage, chainConfig *params.ChainConfig) (*Tracer, error) {
+	if len(cfg) == 0 {
+		cfg = json.RawMessage("{}")
+	}
 	if elem, ok := d.elems[name]; ok {
-		return elem.ctor(ctx, cfg)
+		return elem.ctor(ctx, cfg, chainConfig)
 	}
 	// Assume JS code
-	return d.jsEval(name, ctx, cfg)
+	return d.jsEval(name, ctx, cfg, chainConfig)
 }
 
 // IsJS will return true if the given tracer will evaluate

eth/tracers/internal/tracetest/calltrace_test.go

@@ -129,7 +129,7 @@ func testCallTracer(tracerName string, dirPath string, t *testing.T) {
 				state = tests.MakePreState(rawdb.NewMemoryDatabase(), test.Genesis.Alloc)
 			)
 
-			tracer, err := tracers.DefaultDirectory.New(tracerName, new(tracers.Context), test.TracerConfig)
+			tracer, err := tracers.DefaultDirectory.New(tracerName, new(tracers.Context), test.TracerConfig, test.Genesis.Config)
 			if err != nil {
 				t.Fatalf("failed to create call tracer: %v", err)
 			}
@@ -227,7 +227,7 @@ func benchTracer(tracerName string, test *callTracerTest, b *testing.B) {
 	b.ReportAllocs()
 	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
-		tracer, err := tracers.DefaultDirectory.New(tracerName, new(tracers.Context), nil)
+		tracer, err := tracers.DefaultDirectory.New(tracerName, new(tracers.Context), nil, test.Genesis.Config)
 		if err != nil {
 			b.Fatalf("failed to create call tracer: %v", err)
 		}
@@ -264,7 +264,7 @@ func TestInternals(t *testing.T) {
 		}
 	)
 	mkTracer := func(name string, cfg json.RawMessage) *tracers.Tracer {
-		tr, err := tracers.DefaultDirectory.New(name, nil, cfg)
+		tr, err := tracers.DefaultDirectory.New(name, nil, cfg, config)
 		if err != nil {
 			t.Fatalf("failed to create call tracer: %v", err)
 		}
@@ -448,7 +448,7 @@ func testContractTracer(tracerName string, dirPath string, t *testing.T) {
 				state = tests.MakePreState(rawdb.NewMemoryDatabase(), test.Genesis.Alloc)
 			)
 
-			tracer, err := tracers.DefaultDirectory.New(tracerName, new(tracers.Context), test.TracerConfig)
+			tracer, err := tracers.DefaultDirectory.New(tracerName, new(tracers.Context), test.TracerConfig, nil)
 			if err != nil {
 				t.Fatalf("failed to create call tracer: %v", err)
 			}

eth/tracers/internal/tracetest/flat_calltrace_test.go

@@ -96,7 +96,7 @@ func flatCallTracerTestRunner(tracerName string, filename string, dirPath string
 	state := tests.MakePreState(rawdb.NewMemoryDatabase(), test.Genesis.Alloc)
 
 	// Create the tracer, the EVM environment and run it
-	tracer, err := tracers.DefaultDirectory.New(tracerName, new(tracers.Context), test.TracerConfig)
+	tracer, err := tracers.DefaultDirectory.New(tracerName, new(tracers.Context), test.TracerConfig, test.Genesis.Config)
 	if err != nil {
 		return fmt.Errorf("failed to create call tracer: %v", err)
 	}

eth/tracers/internal/tracetest/prestate_test.go

@@ -105,7 +105,7 @@ func testPrestateDiffTracer(tracerName string, dirPath string, t *testing.T) {
 				state = tests.MakePreState(rawdb.NewMemoryDatabase(), test.Genesis.Alloc)
 			)
 
-			tracer, err := tracers.DefaultDirectory.New(tracerName, new(tracers.Context), test.TracerConfig)
+			tracer, err := tracers.DefaultDirectory.New(tracerName, new(tracers.Context), test.TracerConfig, test.Genesis.Config)
 			if err != nil {
 				t.Fatalf("failed to create call tracer: %v", err)
 			}

eth/tracers/js/goja.go

@@ -33,6 +33,7 @@ import (
 	"github.com/XinFinOrg/XDPoSChain/eth/tracers"
 	"github.com/XinFinOrg/XDPoSChain/eth/tracers/internal"
 	jsassets "github.com/XinFinOrg/XDPoSChain/eth/tracers/js/internal/tracers"
+	"github.com/XinFinOrg/XDPoSChain/params"
 	"github.com/dop251/goja"
 	"github.com/holiman/uint256"
 )
@@ -46,10 +47,10 @@ func init() {
 	if err != nil {
 		panic(err)
 	}
-	type ctorFn = func(*tracers.Context, json.RawMessage) (*tracers.Tracer, error)
+	type ctorFn = func(*tracers.Context, json.RawMessage, *params.ChainConfig) (*tracers.Tracer, error)
 	lookup := func(code string) ctorFn {
-		return func(ctx *tracers.Context, cfg json.RawMessage) (*tracers.Tracer, error) {
+		return func(ctx *tracers.Context, cfg json.RawMessage, chainConfig *params.ChainConfig) (*tracers.Tracer, error) {
-			return newJsTracer(code, ctx, cfg)
+			return newJsTracer(code, ctx, cfg, chainConfig)
 		}
 	}
 	for name, code := range assetTracers {
@@ -110,6 +111,7 @@ func fromBuf(vm *goja.Runtime, bufType goja.Value, buf goja.Value, allowString b
 type jsTracer struct {
 	vm                *goja.Runtime
 	env               *tracing.VMContext
+	chainConfig       *params.ChainConfig
 	toBig             toBigFn               // Converts a hex string into a JS bigint
 	toBuf             toBufFn               // Converts a []byte into a JS buffer
 	fromBuf           fromBufFn             // Converts an array, hex string or Uint8Array to a []byte
@@ -146,13 +148,14 @@ type jsTracer struct {
 // The methods `result` and `fault` are required to be present.
 // The methods `step`, `enter`, and `exit` are optional, but note that
 // `enter` and `exit` always go together.
-func newJsTracer(code string, ctx *tracers.Context, cfg json.RawMessage) (*tracers.Tracer, error) {
+func newJsTracer(code string, ctx *tracers.Context, cfg json.RawMessage, chainConfig *params.ChainConfig) (*tracers.Tracer, error) {
 	vm := goja.New()
 	// By default field names are exported to JS as is, i.e. capitalized.
 	vm.SetFieldNameMapper(goja.UncapFieldNameMapper())
 	t := &jsTracer{
-		vm:  vm,
+		vm:          vm,
-		ctx: make(map[string]goja.Value),
+		ctx:         make(map[string]goja.Value),
+		chainConfig: chainConfig,
 	}
 
 	t.setTypeConverters()
@@ -252,7 +255,7 @@ func (t *jsTracer) OnTxStart(env *tracing.VMContext, tx *types.Transaction, from
 	db := &dbObj{db: env.StateDB, vm: t.vm, toBig: t.toBig, toBuf: t.toBuf, fromBuf: t.fromBuf}
 	t.dbValue = db.setupObject()
 	// Update list of precompiles based on current block
-	rules := env.ChainConfig.Rules(env.BlockNumber)
+	rules := t.chainConfig.Rules(env.BlockNumber)
 	t.activePrecompiles = vm.ActivePrecompiles(rules)
 	t.ctx["block"] = t.vm.ToValue(t.env.BlockNumber.Uint64())
 	t.ctx["gas"] = t.vm.ToValue(tx.Gas())

eth/tracers/js/tracer_test.go

@@ -89,11 +89,12 @@ func runTrace(tracer *tracers.Tracer, vmctx *vmContext, chaincfg *params.ChainCo
 func TestTracer(t *testing.T) {
 	execTracer := func(code string, contract []byte) ([]byte, string) {
 		t.Helper()
-		tracer, err := newJsTracer(code, nil, nil)
+		chainConfig := params.TestChainConfig
+		tracer, err := newJsTracer(code, nil, nil, chainConfig)
 		if err != nil {
 			t.Fatal(err)
 		}
-		ret, err := runTrace(tracer, testCtx(), params.TestChainConfig, contract)
+		ret, err := runTrace(tracer, testCtx(), chainConfig, contract)
 		if err != nil {
 			return nil, err.Error() // Stringify to allow comparison without nil checks
 		}
@@ -166,7 +167,8 @@ func TestTracer(t *testing.T) {
 
 func TestHalt(t *testing.T) {
 	timeout := errors.New("stahp")
-	tracer, err := newJsTracer("{step: function() { while(1); }, result: function() { return null; }, fault: function(){}}", nil, nil)
+	chainConfig := params.TestChainConfig
+	tracer, err := newJsTracer("{step: function() { while(1); }, result: function() { return null; }, fault: function(){}}", nil, nil, chainConfig)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -174,20 +176,21 @@ func TestHalt(t *testing.T) {
 		time.Sleep(1 * time.Second)
 		tracer.Stop(timeout)
 	}()
-	if _, err = runTrace(tracer, testCtx(), params.TestChainConfig, nil); !strings.Contains(err.Error(), "stahp") {
+	if _, err = runTrace(tracer, testCtx(), chainConfig, nil); !strings.Contains(err.Error(), "stahp") {
 		t.Errorf("Expected timeout error, got %v", err)
 	}
 }
 
 func TestHaltBetweenSteps(t *testing.T) {
-	tracer, err := newJsTracer("{step: function() {}, fault: function() {}, result: function() { return null; }}", nil, nil)
+	chainConfig := params.TestChainConfig
+	tracer, err := newJsTracer("{step: function() {}, fault: function() {}, result: function() { return null; }}", nil, nil, chainConfig)
 	if err != nil {
 		t.Fatal(err)
 	}
 	scope := &vm.ScopeContext{
 		Contract: vm.NewContract(&account{}, &account{}, big.NewInt(0), 0),
 	}
-	env := vm.NewEVM(vm.BlockContext{BlockNumber: big.NewInt(1)}, vm.TxContext{GasPrice: big.NewInt(1)}, &dummyStatedb{}, nil, params.TestChainConfig, vm.Config{Tracer: tracer.Hooks})
+	env := vm.NewEVM(vm.BlockContext{BlockNumber: big.NewInt(1)}, vm.TxContext{GasPrice: big.NewInt(1)}, &dummyStatedb{}, nil, chainConfig, vm.Config{Tracer: tracer.Hooks})
 	tracer.OnTxStart(env.GetVMContext(), types.NewTx(&types.LegacyTx{}), common.Address{})
 	tracer.OnEnter(0, byte(vm.CALL), common.Address{}, common.Address{}, []byte{}, 0, big.NewInt(0))
 	tracer.OnOpcode(0, 0, 0, 0, scope, nil, 0, nil)
@@ -205,11 +208,12 @@ func TestHaltBetweenSteps(t *testing.T) {
 func TestNoStepExec(t *testing.T) {
 	execTracer := func(code string) []byte {
 		t.Helper()
-		tracer, err := newJsTracer(code, nil, nil)
+		chainConfig := params.TestChainConfig
+		tracer, err := newJsTracer(code, nil, nil, chainConfig)
 		if err != nil {
 			t.Fatal(err)
 		}
-		env := vm.NewEVM(vm.BlockContext{BlockNumber: big.NewInt(1)}, vm.TxContext{GasPrice: big.NewInt(100)}, &dummyStatedb{}, nil, params.TestChainConfig, vm.Config{Tracer: tracer.Hooks})
+		env := vm.NewEVM(vm.BlockContext{BlockNumber: big.NewInt(1)}, vm.TxContext{GasPrice: big.NewInt(100)}, &dummyStatedb{}, nil, chainConfig, vm.Config{Tracer: tracer.Hooks})
 		tracer.OnTxStart(env.GetVMContext(), types.NewTx(&types.LegacyTx{}), common.Address{})
 		tracer.OnEnter(0, byte(vm.CALL), common.Address{}, common.Address{}, []byte{}, 1000, big.NewInt(0))
 		tracer.OnExit(0, nil, 0, nil, false)
@@ -256,8 +260,7 @@ func TestIsPrecompile(t *testing.T) {
 	chaincfg.IstanbulBlock = big.NewInt(200)
 	chaincfg.BerlinBlock = big.NewInt(300)
 	txCtx := vm.TxContext{GasPrice: big.NewInt(100000)}
-
+	tracer, err := newJsTracer("{addr: toAddress('0000000000000000000000000000000000000009'), res: null, step: function() { this.res = isPrecompiled(this.addr); }, fault: function() {}, result: function() { return this.res; }}", nil, nil, chaincfg)
-	tracer, err := newJsTracer("{addr: toAddress('0000000000000000000000000000000000000009'), res: null, step: function() { this.res = isPrecompiled(this.addr); }, fault: function() {}, result: function() { return this.res; }}", nil, nil)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -271,7 +274,7 @@ func TestIsPrecompile(t *testing.T) {
 		t.Errorf("tracer should not consider blake2f as precompile in byzantium")
 	}
 
-	tracer, _ = newJsTracer("{addr: toAddress('0000000000000000000000000000000000000009'), res: null, step: function() { this.res = isPrecompiled(this.addr); }, fault: function() {}, result: function() { return this.res; }}", nil, nil)
+	tracer, _ = newJsTracer("{addr: toAddress('0000000000000000000000000000000000000009'), res: null, step: function() { this.res = isPrecompiled(this.addr); }, fault: function() {}, result: function() { return this.res; }}", nil, nil, chaincfg)
 	blockCtx = vm.BlockContext{BlockNumber: big.NewInt(250)}
 	res, err = runTrace(tracer, &vmContext{blockCtx, txCtx}, chaincfg, nil)
 	if err != nil {
@@ -283,16 +286,17 @@ func TestIsPrecompile(t *testing.T) {
 }
 
 func TestEnterExit(t *testing.T) {
+	chainConfig := params.TestChainConfig
 	// test that either both or none of enter() and exit() are defined
-	if _, err := newJsTracer("{step: function() {}, fault: function() {}, result: function() { return null; }, enter: function() {}}", new(tracers.Context), nil); err == nil {
+	if _, err := newJsTracer("{step: function() {}, fault: function() {}, result: function() { return null; }, enter: function() {}}", new(tracers.Context), nil, chainConfig); err == nil {
 		t.Fatal("tracer creation should've failed without exit() definition")
 	}
-	if _, err := newJsTracer("{step: function() {}, fault: function() {}, result: function() { return null; }, enter: function() {}, exit: function() {}}", new(tracers.Context), nil); err != nil {
+	if _, err := newJsTracer("{step: function() {}, fault: function() {}, result: function() { return null; }, enter: function() {}, exit: function() {}}", new(tracers.Context), nil, chainConfig); err != nil {
 		t.Fatal(err)
 	}
 
 	// test that the enter and exit method are correctly invoked and the values passed
-	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), nil)
+	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), nil, chainConfig)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -314,7 +318,8 @@ func TestEnterExit(t *testing.T) {
 
 func TestSetup(t *testing.T) {
 	// Test empty config
-	_, err := newJsTracer(`{setup: function(cfg) { if (cfg !== "{}") { throw("invalid empty config") } }, fault: function() {}, result: function() {}}`, new(tracers.Context), nil)
+	chainConfig := params.TestChainConfig
+	_, err := newJsTracer(`{setup: function(cfg) { if (cfg !== "{}") { throw("invalid empty config") } }, fault: function() {}, result: function() {}}`, new(tracers.Context), nil, chainConfig)
 	if err != nil {
 		t.Error(err)
 	}
@@ -324,12 +329,12 @@ func TestSetup(t *testing.T) {
 		t.Fatal(err)
 	}
 	// Test no setup func
-	_, err = newJsTracer(`{fault: function() {}, result: function() {}}`, new(tracers.Context), cfg)
+	_, err = newJsTracer(`{fault: function() {}, result: function() {}}`, new(tracers.Context), cfg, chainConfig)
 	if err != nil {
 		t.Fatal(err)
 	}
 	// Test config value
-	tracer, err := newJsTracer("{config: null, setup: function(cfg) { this.config = JSON.parse(cfg) }, step: function() {}, fault: function() {}, result: function() { return this.config.foo }}", new(tracers.Context), cfg)
+	tracer, err := newJsTracer("{config: null, setup: function(cfg) { this.config = JSON.parse(cfg) }, step: function() {}, fault: function() {}, result: function() { return this.config.foo }}", new(tracers.Context), cfg, chainConfig)
 	if err != nil {
 		t.Fatal(err)
 	}

eth/tracers/live.go

@@ -1,3 +1,19 @@
+// Copyright 2024 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 tracers
 
 import (
@@ -24,6 +40,9 @@ func (d *liveDirectory) Register(name string, f ctorFunc) {
 
 // New instantiates a tracer by name.
 func (d *liveDirectory) New(name string, config json.RawMessage) (*tracing.Hooks, error) {
+	if len(config) == 0 {
+		config = json.RawMessage("{}")
+	}
 	if f, ok := d.elems[name]; ok {
 		return f(config)
 	}

eth/tracers/live/noop.go

@@ -1,3 +1,19 @@
+// Copyright 2024 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 live
 
 import (

eth/tracers/native/4byte.go

@@ -27,6 +27,7 @@ import (
 	"github.com/XinFinOrg/XDPoSChain/core/types"
 	"github.com/XinFinOrg/XDPoSChain/core/vm"
 	"github.com/XinFinOrg/XDPoSChain/eth/tracers"
+	"github.com/XinFinOrg/XDPoSChain/params"
 )
 
 func init() {
@@ -48,17 +49,19 @@ func init() {
 //	  0xc281d19e-0: 1
 //	}
 type fourByteTracer struct {
-	ids               map[string]int   // ids aggregates the 4byte ids found
+	ids               map[string]int // ids aggregates the 4byte ids found
-	interrupt         atomic.Bool      // Atomic flag to signal execution interruption
+	interrupt         atomic.Bool    // Atomic flag to signal execution interruption
-	reason            error            // Textual reason for the interruption
+	reason            error          // Textual reason for the interruption
+	chainConfig       *params.ChainConfig
 	activePrecompiles []common.Address // Updated on tx start based on given rules
 }
 
 // newFourByteTracer returns a native go tracer which collects
 // 4 byte-identifiers of a tx, and implements vm.EVMLogger.
-func newFourByteTracer(ctx *tracers.Context, _ json.RawMessage) (*tracers.Tracer, error) {
+func newFourByteTracer(ctx *tracers.Context, cfg json.RawMessage, chainConfig *params.ChainConfig) (*tracers.Tracer, error) {
 	t := &fourByteTracer{
-		ids: make(map[string]int),
+		ids:         make(map[string]int),
+		chainConfig: chainConfig,
 	}
 	return &tracers.Tracer{
 		Hooks: &tracing.Hooks{
@@ -88,7 +91,7 @@ func (t *fourByteTracer) store(id []byte, size int) {
 
 func (t *fourByteTracer) OnTxStart(env *tracing.VMContext, tx *types.Transaction, from common.Address) {
 	// Update list of precompiles based on current block
-	rules := env.ChainConfig.Rules(env.BlockNumber)
+	rules := t.chainConfig.Rules(env.BlockNumber)
 	t.activePrecompiles = vm.ActivePrecompiles(rules)
 }
 

eth/tracers/native/call.go

@@ -29,6 +29,7 @@ import (
 	"github.com/XinFinOrg/XDPoSChain/core/types"
 	"github.com/XinFinOrg/XDPoSChain/core/vm"
 	"github.com/XinFinOrg/XDPoSChain/eth/tracers"
+	"github.com/XinFinOrg/XDPoSChain/params"
 )
 
 //go:generate go run github.com/fjl/gencodec -type callFrame -field-override callFrameMarshaling -out gen_callframe_json.go
@@ -125,7 +126,7 @@ type callTracerConfig struct {
 
 // newCallTracer returns a native go tracer which tracks
 // call frames of a tx, and implements vm.EVMLogger.
-func newCallTracer(ctx *tracers.Context, cfg json.RawMessage) (*tracers.Tracer, error) {
+func newCallTracer(ctx *tracers.Context, cfg json.RawMessage, chainConfig *params.ChainConfig) (*tracers.Tracer, error) {
 	t, err := newCallTracerObject(ctx, cfg)
 	if err != nil {
 		return nil, err
@@ -145,10 +146,8 @@ func newCallTracer(ctx *tracers.Context, cfg json.RawMessage) (*tracers.Tracer,
 
 func newCallTracerObject(ctx *tracers.Context, cfg json.RawMessage) (*callTracer, error) {
 	var config callTracerConfig
-	if cfg != nil {
+	if err := json.Unmarshal(cfg, &config); err != nil {
-		if err := json.Unmarshal(cfg, &config); err != nil {
+		return nil, err
-			return nil, err
-		}
 	}
 	// First callframe contains tx context info
 	// and is populated on start and end.

eth/tracers/native/call_flat.go

@@ -31,6 +31,7 @@ import (
 	"github.com/XinFinOrg/XDPoSChain/core/types"
 	"github.com/XinFinOrg/XDPoSChain/core/vm"
 	"github.com/XinFinOrg/XDPoSChain/eth/tracers"
+	"github.com/XinFinOrg/XDPoSChain/params"
 )
 
 //go:generate go run github.com/fjl/gencodec -type flatCallAction -field-override flatCallActionMarshaling -out gen_flatcallaction_json.go
@@ -115,6 +116,7 @@ type flatCallResultMarshaling struct {
 type flatCallTracer struct {
 	tracer            *callTracer
 	config            flatCallTracerConfig
+	chainConfig       *params.ChainConfig
 	ctx               *tracers.Context // Holds tracer context data
 	interrupt         atomic.Bool      // Atomic flag to signal execution interruption
 	activePrecompiles []common.Address // Updated on tx start based on given rules
@@ -126,22 +128,20 @@ type flatCallTracerConfig struct {
 }
 
 // newFlatCallTracer returns a new flatCallTracer.
-func newFlatCallTracer(ctx *tracers.Context, cfg json.RawMessage) (*tracers.Tracer, error) {
+func newFlatCallTracer(ctx *tracers.Context, cfg json.RawMessage, chainConfig *params.ChainConfig) (*tracers.Tracer, error) {
 	var config flatCallTracerConfig
-	if cfg != nil {
+	if err := json.Unmarshal(cfg, &config); err != nil {
-		if err := json.Unmarshal(cfg, &config); err != nil {
+		return nil, err
-			return nil, err
-		}
 	}
 
 	// Create inner call tracer with default configuration, don't forward
 	// the OnlyTopCall or WithLog to inner for now
-	t, err := newCallTracerObject(ctx, nil)
+	t, err := newCallTracerObject(ctx, json.RawMessage("{}"))
 	if err != nil {
 		return nil, err
 	}
 
-	ft := &flatCallTracer{tracer: t, ctx: ctx, config: config}
+	ft := &flatCallTracer{tracer: t, ctx: ctx, config: config, chainConfig: chainConfig}
 	return &tracers.Tracer{
 		Hooks: &tracing.Hooks{
 			OnTxStart: ft.OnTxStart,
@@ -207,7 +207,7 @@ func (t *flatCallTracer) OnTxStart(env *tracing.VMContext, tx *types.Transaction
 	}
 	t.tracer.OnTxStart(env, tx, from)
 	// Update list of precompiles based on current block
-	rules := env.ChainConfig.Rules(env.BlockNumber)
+	rules := t.chainConfig.Rules(env.BlockNumber)
 	t.activePrecompiles = vm.ActivePrecompiles(rules)
 }
 

eth/tracers/native/call_flat_test.go

@@ -31,7 +31,7 @@ import (
 )
 
 func TestCallFlatStop(t *testing.T) {
-	tracer, err := tracers.DefaultDirectory.New("flatCallTracer", &tracers.Context{}, nil)
+	tracer, err := tracers.DefaultDirectory.New("flatCallTracer", &tracers.Context{}, nil, params.MainnetChainConfig)
 	require.NoError(t, err)
 
 	// this error should be returned by GetResult
@@ -47,9 +47,7 @@ func TestCallFlatStop(t *testing.T) {
 		Data:     nil,
 	})
 
-	tracer.OnTxStart(&tracing.VMContext{
+	tracer.OnTxStart(&tracing.VMContext{}, tx, common.Address{})
-		ChainConfig: params.MainnetChainConfig,
-	}, tx, common.Address{})
 
 	tracer.OnEnter(0, byte(vm.CALL), common.Address{}, common.Address{}, nil, 0, big.NewInt(0))
 

eth/tracers/native/contract.go

@@ -12,6 +12,7 @@ import (
 	"github.com/XinFinOrg/XDPoSChain/core/types"
 	"github.com/XinFinOrg/XDPoSChain/core/vm"
 	"github.com/XinFinOrg/XDPoSChain/eth/tracers"
+	"github.com/XinFinOrg/XDPoSChain/params"
 )
 
 func init() {
@@ -30,7 +31,7 @@ type contractTracerConfig struct {
 }
 
 // NewContractTracer returns a native go tracer which tracks the contractor was created
-func NewContractTracer(ctx *tracers.Context, cfg json.RawMessage) (*tracers.Tracer, error) {
+func NewContractTracer(ctx *tracers.Context, cfg json.RawMessage, _ *params.ChainConfig) (*tracers.Tracer, error) {
 	var config contractTracerConfig
 	if cfg != nil {
 		if err := json.Unmarshal(cfg, &config); err != nil {

eth/tracers/native/mux.go

@@ -24,6 +24,7 @@ import (
 	"github.com/XinFinOrg/XDPoSChain/core/tracing"
 	"github.com/XinFinOrg/XDPoSChain/core/types"
 	"github.com/XinFinOrg/XDPoSChain/eth/tracers"
+	"github.com/XinFinOrg/XDPoSChain/params"
 )
 
 func init() {
@@ -38,17 +39,15 @@ type muxTracer struct {
 }
 
 // newMuxTracer returns a new mux tracer.
-func newMuxTracer(ctx *tracers.Context, cfg json.RawMessage) (*tracers.Tracer, error) {
+func newMuxTracer(ctx *tracers.Context, cfg json.RawMessage, chainConfig *params.ChainConfig) (*tracers.Tracer, error) {
 	var config map[string]json.RawMessage
-	if cfg != nil {
+	if err := json.Unmarshal(cfg, &config); err != nil {
-		if err := json.Unmarshal(cfg, &config); err != nil {
+		return nil, err
-			return nil, err
-		}
 	}
 	objects := make([]*tracers.Tracer, 0, len(config))
 	names := make([]string, 0, len(config))
 	for k, v := range config {
-		t, err := tracers.DefaultDirectory.New(k, ctx, v)
+		t, err := tracers.DefaultDirectory.New(k, ctx, v, chainConfig)
 		if err != nil {
 			return nil, err
 		}

eth/tracers/native/noop.go

@@ -24,6 +24,7 @@ import (
 	"github.com/XinFinOrg/XDPoSChain/core/tracing"
 	"github.com/XinFinOrg/XDPoSChain/core/types"
 	"github.com/XinFinOrg/XDPoSChain/eth/tracers"
+	"github.com/XinFinOrg/XDPoSChain/params"
 )
 
 func init() {
@@ -33,7 +34,7 @@ func init() {
 type noopTracer struct{}
 
 // newNoopTracer returns a new noop tracer.
-func newNoopTracer(ctx *tracers.Context, _ json.RawMessage) (*tracers.Tracer, error) {
+func newNoopTracer(ctx *tracers.Context, cfg json.RawMessage, chainConfig *params.ChainConfig) (*tracers.Tracer, error) {
 	t := &noopTracer{}
 	return &tracers.Tracer{
 		Hooks: &tracing.Hooks{

eth/tracers/native/prestate.go

@@ -31,6 +31,7 @@ import (
 	"github.com/XinFinOrg/XDPoSChain/eth/tracers"
 	"github.com/XinFinOrg/XDPoSChain/eth/tracers/internal"
 	"github.com/XinFinOrg/XDPoSChain/log"
+	"github.com/XinFinOrg/XDPoSChain/params"
 )
 
 //go:generate go run github.com/fjl/gencodec -type account -field-override accountMarshaling -out gen_account_json.go
@@ -76,12 +77,10 @@ type prestateTracerConfig struct {
 	DisableStorage bool `json:"disableStorage"` // If true, this tracer will not return the contract storage
 }
 
-func newPrestateTracer(ctx *tracers.Context, cfg json.RawMessage) (*tracers.Tracer, error) {
+func newPrestateTracer(ctx *tracers.Context, cfg json.RawMessage, chainConfig *params.ChainConfig) (*tracers.Tracer, error) {
 	var config prestateTracerConfig
-	if cfg != nil {
+	if err := json.Unmarshal(cfg, &config); err != nil {
-		if err := json.Unmarshal(cfg, &config); err != nil {
+		return nil, err
-			return nil, err
-		}
 	}
 	t := &prestateTracer{
 		pre:     stateMap{},