eth/tracers: various fixes (#30540)

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.

cmd/evm/internal/t8ntool/execution.go

@@ -132,7 +132,7 @@ type rejectedTx struct {
 // Apply applies a set of transactions to a pre-state
 func (pre *Prestate) Apply(vmConfig vm.Config, chainConfig *params.ChainConfig,
 	txIt txIterator, miningReward int64,
-	getTracerFn func(txIndex int, txHash common.Hash) (*tracers.Tracer, io.WriteCloser, error)) (*state.StateDB, *ExecutionResult, []byte, error) {
+	getTracerFn func(txIndex int, txHash common.Hash, chainConfig *params.ChainConfig) (*tracers.Tracer, io.WriteCloser, error)) (*state.StateDB, *ExecutionResult, []byte, error) {
 	// Capture errors for BLOCKHASH operation, if we haven't been supplied the
 	// required blockhashes
 	var hashError error
@@ -242,7 +242,7 @@ func (pre *Prestate) Apply(vmConfig vm.Config, chainConfig *params.ChainConfig,
 				continue
 			}
 		}
-		tracer, traceOutput, err := getTracerFn(txIndex, tx.Hash())
+		tracer, traceOutput, err := getTracerFn(txIndex, tx.Hash(), chainConfig)
 		if err != nil {
 			return nil, nil, nil, err
 		}

cmd/evm/internal/t8ntool/transition.go

@@ -82,7 +82,9 @@ type input struct {
 }
 
 func Transition(ctx *cli.Context) error {
-	var getTracer = func(txIndex int, txHash common.Hash) (*tracers.Tracer, io.WriteCloser, error) { return nil, nil, nil }
+	var getTracer = func(txIndex int, txHash common.Hash, chainConfig *params.ChainConfig) (*tracers.Tracer, io.WriteCloser, error) {
+		return nil, nil, nil
+	}
 
 	baseDir, err := createBasedir(ctx)
 	if err != nil {
@@ -97,7 +99,7 @@ func Transition(ctx *cli.Context) error {
 			EnableReturnData: ctx.Bool(TraceEnableReturnDataFlag.Name),
 			Debug:            true,
 		}
-		getTracer = func(txIndex int, txHash common.Hash) (*tracers.Tracer, io.WriteCloser, error) {
+		getTracer = func(txIndex int, txHash common.Hash, _ *params.ChainConfig) (*tracers.Tracer, io.WriteCloser, error) {
 			traceFile, err := os.Create(filepath.Join(baseDir, fmt.Sprintf("trace-%d-%v.jsonl", txIndex, txHash.String())))
 			if err != nil {
 				return nil, nil, NewError(ErrorIO, fmt.Errorf("failed creating trace-file: %v", err))
@@ -121,12 +123,12 @@ func Transition(ctx *cli.Context) error {
 		if ctx.IsSet(TraceTracerConfigFlag.Name) {
 			config = []byte(ctx.String(TraceTracerConfigFlag.Name))
 		}
-		getTracer = func(txIndex int, txHash common.Hash) (*tracers.Tracer, io.WriteCloser, error) {
+		getTracer = func(txIndex int, txHash common.Hash, chainConfig *params.ChainConfig) (*tracers.Tracer, io.WriteCloser, error) {
 			traceFile, err := os.Create(filepath.Join(baseDir, fmt.Sprintf("trace-%d-%v.json", txIndex, txHash.String())))
 			if err != nil {
 				return nil, nil, NewError(ErrorIO, fmt.Errorf("failed creating trace-file: %v", err))
 			}
-			tracer, err := tracers.DefaultDirectory.New(ctx.String(TraceTracerFlag.Name), nil, config)
+			tracer, err := tracers.DefaultDirectory.New(ctx.String(TraceTracerFlag.Name), nil, config, chainConfig)
 			if err != nil {
 				return nil, nil, NewError(ErrorConfig, fmt.Errorf("failed instantiating tracer: %w", err))
 			}

cmd/utils/flags.go

@@ -543,6 +543,7 @@ var (
 	VMTraceJsonConfigFlag = &cli.StringFlag{
 		Name:     "vmtrace.jsonconfig",
 		Usage:    "Tracer configuration (JSON)",
+		Value:    "{}",
 		Category: flags.VMCategory,
 	}
 	// API options.
@@ -1899,13 +1900,8 @@ 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)
 		}
 	}
 }
@@ -2186,10 +2182,7 @@ func MakeChain(ctx *cli.Context, stack *node.Node, readonly bool) (*core.BlockCh
 	}
 	if ctx.IsSet(VMTraceFlag.Name) {
 		if name := ctx.String(VMTraceFlag.Name); name != "" {
-			var config json.RawMessage
-			if ctx.IsSet(VMTraceJsonConfigFlag.Name) {
-				config = json.RawMessage(ctx.String(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

@@ -55,9 +55,8 @@ type VMContext struct {
 	Time        uint64
 	Random      *common.Hash
 	// Effective tx gas price
-	GasPrice    *big.Int
-	ChainConfig *params.ChainConfig
-	StateDB     StateDB
+	GasPrice *big.Int
+	StateDB  StateDB
 }
 
 // BlockEvent is emitted upon tracing an incoming block.

core/vm/evm.go

@@ -613,7 +613,6 @@ 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

@@ -395,7 +395,7 @@ func benchmarkNonModifyingCode(gas uint64, code []byte, name string, tracerCode
 	cfg.State, _ = state.New(types.EmptyRootHash, state.NewDatabaseForTesting())
 	cfg.GasLimit = gas
 	if len(tracerCode) > 0 {
-		tracer, err := tracers.DefaultDirectory.New(tracerCode, new(tracers.Context), nil)
+		tracer, err := tracers.DefaultDirectory.New(tracerCode, new(tracers.Context), nil, cfg.ChainConfig)
 		if err != nil {
 			b.Fatal(err)
 		}
@@ -887,7 +887,7 @@ 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.MergedTestChainConfig)
 			if err != nil {
 				t.Fatal(err)
 			}
@@ -922,7 +922,7 @@ func TestJSTracerCreateTx(t *testing.T) {
 	code := []byte{byte(vm.PUSH1), 0, byte(vm.PUSH1), 0, byte(vm.RETURN)}
 
 	statedb, _ := state.New(types.EmptyRootHash, state.NewDatabaseForTesting())
-	tracer, err := tracers.DefaultDirectory.New(jsTracer, new(tracers.Context), nil)
+	tracer, err := tracers.DefaultDirectory.New(jsTracer, new(tracers.Context), nil, params.MergedTestChainConfig)
 	if err != nil {
 		t.Fatal(err)
 	}

eth/backend.go

@@ -197,7 +197,7 @@ func New(stack *node.Node, config *ethconfig.Config) (*Ethereum, error) {
 		}
 	)
 	if config.VMTrace != "" {
-		var traceConfig json.RawMessage
+		traceConfig := json.RawMessage("{}")
 		if config.VMTraceJsonConfig != "" {
 			traceConfig = json.RawMessage(config.VMTraceJsonConfig)
 		}

eth/tracers/api.go

@@ -1011,7 +1011,7 @@ 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/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/tracing"
+	"github.com/ethereum/go-ethereum/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 jsCtorFn func(string, *Context, json.RawMessage) (*Tracer, error)
+type ctorFn func(*Context, json.RawMessage, *params.ChainConfig) (*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

@@ -120,7 +120,7 @@ func testCallTracer(tracerName string, dirPath string, t *testing.T) {
 			)
 			state.Close()
 
-			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)
 		}

eth/tracers/internal/tracetest/flat_calltrace_test.go

@@ -89,7 +89,7 @@ func flatCallTracerTestRunner(tracerName string, filename string, dirPath string
 	defer state.Close()
 
 	// 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

@@ -97,7 +97,7 @@ func testPrestateDiffTracer(tracerName string, dirPath string, t *testing.T) {
 			)
 			defer state.Close()
 
-			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

@@ -28,6 +28,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/eth/tracers"
 	"github.com/ethereum/go-ethereum/eth/tracers/internal"
+	"github.com/ethereum/go-ethereum/params"
 	"github.com/holiman/uint256"
 
 	"github.com/ethereum/go-ethereum/common"
@@ -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 newJsTracer(code, ctx, cfg)
+		return func(ctx *tracers.Context, cfg json.RawMessage, chainConfig *params.ChainConfig) (*tracers.Tracer, error) {
+			return newJsTracer(code, ctx, cfg, chainConfig)
 		}
 	}
 	for name, code := range assetTracers {
@@ -102,6 +103,7 @@ 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
@@ -138,13 +140,14 @@ 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,
-		ctx: make(map[string]goja.Value),
+		vm:          vm,
+		ctx:         make(map[string]goja.Value),
+		chainConfig: chainConfig,
 	}
 
 	t.setTypeConverters()
@@ -244,7 +247,7 @@ 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, env.Random != nil, env.Time)
+	rules := t.chainConfig.Rules(env.BlockNumber, env.Random != nil, env.Time)
 	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

@@ -90,11 +90,12 @@ 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
 		}
@@ -167,7 +168,8 @@ 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)
 	}
@@ -175,20 +177,21 @@ 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{}, uint256.NewInt(0), 0),
 	}
-	env := vm.NewEVM(vm.BlockContext{BlockNumber: big.NewInt(1)}, vm.TxContext{GasPrice: big.NewInt(1)}, &dummyStatedb{}, params.TestChainConfig, vm.Config{Tracer: tracer.Hooks})
+	env := vm.NewEVM(vm.BlockContext{BlockNumber: big.NewInt(1)}, vm.TxContext{GasPrice: big.NewInt(1)}, &dummyStatedb{}, 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)
@@ -206,11 +209,12 @@ 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{}, params.TestChainConfig, vm.Config{Tracer: tracer.Hooks})
+		env := vm.NewEVM(vm.BlockContext{BlockNumber: big.NewInt(1)}, vm.TxContext{GasPrice: big.NewInt(100)}, &dummyStatedb{}, 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)
@@ -241,7 +245,7 @@ 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)
+	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)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -255,7 +259,7 @@ 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 {
@@ -267,15 +271,16 @@ 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)
 	}
@@ -297,7 +302,8 @@ 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)
 	}
@@ -307,12 +313,12 @@ 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/live/supply.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 (
@@ -19,7 +35,7 @@ import (
 )
 
 func init() {
-	tracers.LiveDirectory.Register("supply", newSupply)
+	tracers.LiveDirectory.Register("supply", newSupplyTracer)
 }
 
 type supplyInfoIssuance struct {
@@ -63,7 +79,7 @@ type supplyTxCallstack struct {
 	burn  *big.Int
 }
 
-type supply struct {
+type supplyTracer struct {
 	delta       supplyInfo
 	txCallstack []supplyTxCallstack // Callstack for current transaction
 	logger      *lumberjack.Logger
@@ -74,12 +90,10 @@ type supplyTracerConfig struct {
 	MaxSize int    `json:"maxSize"` // MaxSize is the maximum size in megabytes of the tracer log file before it gets rotated. It defaults to 100 megabytes.
 }
 
-func newSupply(cfg json.RawMessage) (*tracing.Hooks, error) {
+func newSupplyTracer(cfg json.RawMessage) (*tracing.Hooks, error) {
 	var config supplyTracerConfig
-	if cfg != nil {
-		if err := json.Unmarshal(cfg, &config); err != nil {
-			return nil, fmt.Errorf("failed to parse config: %v", err)
-		}
+	if err := json.Unmarshal(cfg, &config); err != nil {
+		return nil, fmt.Errorf("failed to parse config: %v", err)
 	}
 	if config.Path == "" {
 		return nil, errors.New("supply tracer output path is required")
@@ -93,19 +107,19 @@ func newSupply(cfg json.RawMessage) (*tracing.Hooks, error) {
 		logger.MaxSize = config.MaxSize
 	}
 
-	t := &supply{
+	t := &supplyTracer{
 		delta:  newSupplyInfo(),
 		logger: logger,
 	}
 	return &tracing.Hooks{
-		OnBlockStart:    t.OnBlockStart,
-		OnBlockEnd:      t.OnBlockEnd,
-		OnGenesisBlock:  t.OnGenesisBlock,
-		OnTxStart:       t.OnTxStart,
-		OnBalanceChange: t.OnBalanceChange,
-		OnEnter:         t.OnEnter,
-		OnExit:          t.OnExit,
-		OnClose:         t.OnClose,
+		OnBlockStart:    t.onBlockStart,
+		OnBlockEnd:      t.onBlockEnd,
+		OnGenesisBlock:  t.onGenesisBlock,
+		OnTxStart:       t.onTxStart,
+		OnBalanceChange: t.onBalanceChange,
+		OnEnter:         t.onEnter,
+		OnExit:          t.onExit,
+		OnClose:         t.onClose,
 	}, nil
 }
 
@@ -128,11 +142,11 @@ func newSupplyInfo() supplyInfo {
 	}
 }
 
-func (s *supply) resetDelta() {
+func (s *supplyTracer) resetDelta() {
 	s.delta = newSupplyInfo()
 }
 
-func (s *supply) OnBlockStart(ev tracing.BlockEvent) {
+func (s *supplyTracer) onBlockStart(ev tracing.BlockEvent) {
 	s.resetDelta()
 
 	s.delta.Number = ev.Block.NumberU64()
@@ -155,11 +169,11 @@ func (s *supply) OnBlockStart(ev tracing.BlockEvent) {
 	}
 }
 
-func (s *supply) OnBlockEnd(err error) {
+func (s *supplyTracer) onBlockEnd(err error) {
 	s.write(s.delta)
 }
 
-func (s *supply) OnGenesisBlock(b *types.Block, alloc types.GenesisAlloc) {
+func (s *supplyTracer) onGenesisBlock(b *types.Block, alloc types.GenesisAlloc) {
 	s.resetDelta()
 
 	s.delta.Number = b.NumberU64()
@@ -174,7 +188,7 @@ func (s *supply) OnGenesisBlock(b *types.Block, alloc types.GenesisAlloc) {
 	s.write(s.delta)
 }
 
-func (s *supply) OnBalanceChange(a common.Address, prevBalance, newBalance *big.Int, reason tracing.BalanceChangeReason) {
+func (s *supplyTracer) onBalanceChange(a common.Address, prevBalance, newBalance *big.Int, reason tracing.BalanceChangeReason) {
 	diff := new(big.Int).Sub(newBalance, prevBalance)
 
 	// NOTE: don't handle "BalanceIncreaseGenesisBalance" because it is handled in OnGenesisBlock
@@ -193,12 +207,12 @@ func (s *supply) OnBalanceChange(a common.Address, prevBalance, newBalance *big.
 	}
 }
 
-func (s *supply) OnTxStart(vm *tracing.VMContext, tx *types.Transaction, from common.Address) {
+func (s *supplyTracer) onTxStart(vm *tracing.VMContext, tx *types.Transaction, from common.Address) {
 	s.txCallstack = make([]supplyTxCallstack, 0, 1)
 }
 
 // internalTxsHandler handles internal transactions burned amount
-func (s *supply) internalTxsHandler(call *supplyTxCallstack) {
+func (s *supplyTracer) internalTxsHandler(call *supplyTxCallstack) {
 	// Handle Burned amount
 	if call.burn != nil {
 		s.delta.Burn.Misc.Add(s.delta.Burn.Misc, call.burn)
@@ -211,7 +225,7 @@ func (s *supply) internalTxsHandler(call *supplyTxCallstack) {
 	}
 }
 
-func (s *supply) OnEnter(depth int, typ byte, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int) {
+func (s *supplyTracer) onEnter(depth int, typ byte, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int) {
 	call := supplyTxCallstack{
 		calls: make([]supplyTxCallstack, 0),
 	}
@@ -226,7 +240,7 @@ func (s *supply) OnEnter(depth int, typ byte, from common.Address, to common.Add
 	s.txCallstack = append(s.txCallstack, call)
 }
 
-func (s *supply) OnExit(depth int, output []byte, gasUsed uint64, err error, reverted bool) {
+func (s *supplyTracer) onExit(depth int, output []byte, gasUsed uint64, err error, reverted bool) {
 	if depth == 0 {
 		// No need to handle Burned amount if transaction is reverted
 		if !reverted {
@@ -252,13 +266,13 @@ func (s *supply) OnExit(depth int, output []byte, gasUsed uint64, err error, rev
 	s.txCallstack[size-1].calls = append(s.txCallstack[size-1].calls, call)
 }
 
-func (s *supply) OnClose() {
+func (s *supplyTracer) onClose() {
 	if err := s.logger.Close(); err != nil {
 		log.Warn("failed to close supply tracer log file", "error", err)
 	}
 }
 
-func (s *supply) write(data any) {
+func (s *supplyTracer) write(data any) {
 	supply, ok := data.(supplyInfo)
 	if !ok {
 		log.Warn("failed to cast supply tracer data on write to log file")

eth/tracers/native/4byte.go

@@ -27,6 +27,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/eth/tracers"
+	"github.com/ethereum/go-ethereum/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
-	interrupt         atomic.Bool      // Atomic flag to signal execution interruption
-	reason            error            // Textual reason for the interruption
+	ids               map[string]int // ids aggregates the 4byte ids found
+	interrupt         atomic.Bool    // Atomic flag to signal execution 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, env.Random != nil, env.Time)
+	rules := t.chainConfig.Rules(env.BlockNumber, env.Random != nil, env.Time)
 	t.activePrecompiles = vm.ActivePrecompiles(rules)
 }
 

eth/tracers/native/call.go

@@ -29,6 +29,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/eth/tracers"
+	"github.com/ethereum/go-ethereum/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 {
-			return nil, err
-		}
+	if err := json.Unmarshal(cfg, &config); err != nil {
+		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/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/core/vm"
 	"github.com/ethereum/go-ethereum/eth/tracers"
+	"github.com/ethereum/go-ethereum/params"
 )
 
 //go:generate go run github.com/fjl/gencodec -type flatCallAction -field-override flatCallActionMarshaling -out gen_flatcallaction_json.go
@@ -114,6 +115,7 @@ 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
@@ -125,22 +127,20 @@ 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 {
-			return nil, err
-		}
+	if err := json.Unmarshal(cfg, &config); err != nil {
+		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,
@@ -206,7 +206,7 @@ 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, env.Random != nil, env.Time)
+	rules := t.chainConfig.Rules(env.BlockNumber, env.Random != nil, env.Time)
 	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{
-		ChainConfig: params.MainnetChainConfig,
-	}, tx, common.Address{})
+	tracer.OnTxStart(&tracing.VMContext{}, tx, common.Address{})
 
 	tracer.OnEnter(0, byte(vm.CALL), common.Address{}, common.Address{}, nil, 0, big.NewInt(0))
 

eth/tracers/native/mux.go

@@ -24,6 +24,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/tracing"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/eth/tracers"
+	"github.com/ethereum/go-ethereum/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 {
-			return nil, err
-		}
+	if err := json.Unmarshal(cfg, &config); err != nil {
+		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/ethereum/go-ethereum/core/tracing"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/eth/tracers"
+	"github.com/ethereum/go-ethereum/params"
 )
 
 func init() {
@@ -35,7 +36,7 @@ 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/ethereum/go-ethereum/eth/tracers"
 	"github.com/ethereum/go-ethereum/eth/tracers/internal"
 	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethereum/go-ethereum/params"
 )
 
 //go:generate go run github.com/fjl/gencodec -type account -field-override accountMarshaling -out gen_account_json.go
@@ -74,12 +75,10 @@ type prestateTracerConfig struct {
 	DiffMode bool `json:"diffMode"` // If true, this tracer will return state modifications
 }
 
-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 {
-			return nil, err
-		}
+	if err := json.Unmarshal(cfg, &config); err != nil {
+		return nil, err
 	}
 	t := &prestateTracer{
 		pre:     stateMap{},