core,eth: call frame tracing (#23087)

This change introduces 2 new optional methods; `enter()` and `exit()` for js tracers, and makes `step()` optiona. The two new methods are invoked when entering and exiting a call frame (but not invoked for the outermost scope, which has it's own methods). Currently these are the data fields passed to each of them:

    enter: type (opcode), from, to, input, gas, value
    exit: output, gasUsed, error

The PR also comes with a re-write of the callTracer. As a backup we keep the previous tracing script under the name `callTracerLegacy`. Behaviour of both tracers are equivalent for the most part, although there are some small differences (improvements), where the new tracer is more correct / has more information. 

core/vm/access_list_tracer.go

@@ -166,6 +166,11 @@ func (*AccessListTracer) CaptureFault(env *EVM, pc uint64, op OpCode, gas, cost
 
 func (*AccessListTracer) CaptureEnd(output []byte, gasUsed uint64, t time.Duration, err error) {}
 
+func (*AccessListTracer) CaptureEnter(typ OpCode, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int) {
+}
+
+func (*AccessListTracer) CaptureExit(output []byte, gasUsed uint64, err error) {}
+
 // AccessList returns the current accesslist maintained by the tracer.
 func (a *AccessListTracer) AccessList() types.AccessList {
 	return a.list.accessList()

core/vm/evm.go

@@ -193,11 +193,19 @@ func (evm *EVM) Call(caller ContractRef, addr common.Address, input []byte, gas
 	evm.Context.Transfer(evm.StateDB, caller.Address(), addr, value)
 
 	// Capture the tracer start/end events in debug mode
-	if evm.Config.Debug && evm.depth == 0 {
-		evm.Config.Tracer.CaptureStart(evm, caller.Address(), addr, false, input, gas, value)
-		defer func(startGas uint64, startTime time.Time) { // Lazy evaluation of the parameters
-			evm.Config.Tracer.CaptureEnd(ret, startGas-gas, time.Since(startTime), err)
-		}(gas, time.Now())
+	if evm.Config.Debug {
+		if evm.depth == 0 {
+			evm.Config.Tracer.CaptureStart(evm, caller.Address(), addr, false, input, gas, value)
+			defer func(startGas uint64, startTime time.Time) { // Lazy evaluation of the parameters
+				evm.Config.Tracer.CaptureEnd(ret, startGas-gas, time.Since(startTime), err)
+			}(gas, time.Now())
+		} else {
+			// Handle tracer events for entering and exiting a call frame
+			evm.Config.Tracer.CaptureEnter(CALL, caller.Address(), addr, input, gas, value)
+			defer func(startGas uint64) {
+				evm.Config.Tracer.CaptureExit(ret, startGas-gas, err)
+			}(gas)
+		}
 	}
 
 	if isPrecompile {
@@ -257,6 +265,14 @@ func (evm *EVM) CallCode(caller ContractRef, addr common.Address, input []byte,
 	}
 	var snapshot = evm.StateDB.Snapshot()
 
+	// Invoke tracer hooks that signal entering/exiting a call frame
+	if evm.Config.Debug {
+		evm.Config.Tracer.CaptureEnter(CALLCODE, caller.Address(), addr, input, gas, value)
+		defer func(startGas uint64) {
+			evm.Config.Tracer.CaptureExit(ret, startGas-gas, err)
+		}(gas)
+	}
+
 	// It is allowed to call precompiles, even via delegatecall
 	if p, isPrecompile := evm.precompile(addr); isPrecompile {
 		ret, gas, err = RunPrecompiledContract(p, input, gas)
@@ -293,6 +309,14 @@ func (evm *EVM) DelegateCall(caller ContractRef, addr common.Address, input []by
 	}
 	var snapshot = evm.StateDB.Snapshot()
 
+	// Invoke tracer hooks that signal entering/exiting a call frame
+	if evm.Config.Debug {
+		evm.Config.Tracer.CaptureEnter(DELEGATECALL, caller.Address(), addr, input, gas, nil)
+		defer func(startGas uint64) {
+			evm.Config.Tracer.CaptureExit(ret, startGas-gas, err)
+		}(gas)
+	}
+
 	// It is allowed to call precompiles, even via delegatecall
 	if p, isPrecompile := evm.precompile(addr); isPrecompile {
 		ret, gas, err = RunPrecompiledContract(p, input, gas)
@@ -338,6 +362,14 @@ func (evm *EVM) StaticCall(caller ContractRef, addr common.Address, input []byte
 	// future scenarios
 	evm.StateDB.AddBalance(addr, big0)
 
+	// Invoke tracer hooks that signal entering/exiting a call frame
+	if evm.Config.Debug {
+		evm.Config.Tracer.CaptureEnter(STATICCALL, caller.Address(), addr, input, gas, nil)
+		defer func(startGas uint64) {
+			evm.Config.Tracer.CaptureExit(ret, startGas-gas, err)
+		}(gas)
+	}
+
 	if p, isPrecompile := evm.precompile(addr); isPrecompile {
 		ret, gas, err = RunPrecompiledContract(p, input, gas)
 	} else {
@@ -377,7 +409,7 @@ func (c *codeAndHash) Hash() common.Hash {
 }
 
 // create creates a new contract using code as deployment code.
-func (evm *EVM) create(caller ContractRef, codeAndHash *codeAndHash, gas uint64, value *big.Int, address common.Address) ([]byte, common.Address, uint64, error) {
+func (evm *EVM) create(caller ContractRef, codeAndHash *codeAndHash, gas uint64, value *big.Int, address common.Address, typ OpCode) ([]byte, common.Address, uint64, error) {
 	// Depth check execution. Fail if we're trying to execute above the
 	// limit.
 	if evm.depth > int(params.CallCreateDepth) {
@@ -415,9 +447,14 @@ func (evm *EVM) create(caller ContractRef, codeAndHash *codeAndHash, gas uint64,
 		return nil, address, gas, nil
 	}
 
-	if evm.Config.Debug && evm.depth == 0 {
-		evm.Config.Tracer.CaptureStart(evm, caller.Address(), address, true, codeAndHash.code, gas, value)
+	if evm.Config.Debug {
+		if evm.depth == 0 {
+			evm.Config.Tracer.CaptureStart(evm, caller.Address(), address, true, codeAndHash.code, gas, value)
+		} else {
+			evm.Config.Tracer.CaptureEnter(typ, caller.Address(), address, codeAndHash.code, gas, value)
+		}
 	}
+
 	start := time.Now()
 
 	ret, err := evm.interpreter.Run(contract, nil, false)
@@ -455,8 +492,12 @@ func (evm *EVM) create(caller ContractRef, codeAndHash *codeAndHash, gas uint64,
 		}
 	}
 
-	if evm.Config.Debug && evm.depth == 0 {
-		evm.Config.Tracer.CaptureEnd(ret, gas-contract.Gas, time.Since(start), err)
+	if evm.Config.Debug {
+		if evm.depth == 0 {
+			evm.Config.Tracer.CaptureEnd(ret, gas-contract.Gas, time.Since(start), err)
+		} else {
+			evm.Config.Tracer.CaptureExit(ret, gas-contract.Gas, err)
+		}
 	}
 	return ret, address, contract.Gas, err
 }
@@ -464,7 +505,7 @@ func (evm *EVM) create(caller ContractRef, codeAndHash *codeAndHash, gas uint64,
 // Create creates a new contract using code as deployment code.
 func (evm *EVM) Create(caller ContractRef, code []byte, gas uint64, value *big.Int) (ret []byte, contractAddr common.Address, leftOverGas uint64, err error) {
 	contractAddr = crypto.CreateAddress(caller.Address(), evm.StateDB.GetNonce(caller.Address()))
-	return evm.create(caller, &codeAndHash{code: code}, gas, value, contractAddr)
+	return evm.create(caller, &codeAndHash{code: code}, gas, value, contractAddr, CREATE)
 }
 
 // Create2 creates a new contract using code as deployment code.
@@ -474,7 +515,7 @@ func (evm *EVM) Create(caller ContractRef, code []byte, gas uint64, value *big.I
 func (evm *EVM) Create2(caller ContractRef, code []byte, gas uint64, endowment *big.Int, salt *uint256.Int) (ret []byte, contractAddr common.Address, leftOverGas uint64, err error) {
 	codeAndHash := &codeAndHash{code: code}
 	contractAddr = crypto.CreateAddress2(caller.Address(), salt.Bytes32(), codeAndHash.Hash().Bytes())
-	return evm.create(caller, codeAndHash, gas, endowment, contractAddr)
+	return evm.create(caller, codeAndHash, gas, endowment, contractAddr, CREATE2)
 }
 
 // ChainConfig returns the environment's chain configuration

core/vm/instructions.go

@@ -791,6 +791,10 @@ func opSuicide(pc *uint64, interpreter *EVMInterpreter, scope *ScopeContext) ([]
 	balance := interpreter.evm.StateDB.GetBalance(scope.Contract.Address())
 	interpreter.evm.StateDB.AddBalance(beneficiary.Bytes20(), balance)
 	interpreter.evm.StateDB.Suicide(scope.Contract.Address())
+	if interpreter.cfg.Debug {
+		interpreter.cfg.Tracer.CaptureEnter(SELFDESTRUCT, scope.Contract.Address(), beneficiary.Bytes20(), []byte{}, 0, balance)
+		interpreter.cfg.Tracer.CaptureExit([]byte{}, 0, nil)
+	}
 	return nil, nil
 }
 

core/vm/logger.go

@@ -106,6 +106,8 @@ func (s *StructLog) ErrorString() string {
 type Tracer 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)
+	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)
 	CaptureEnd(output []byte, gasUsed uint64, t time.Duration, err error)
 }
@@ -225,6 +227,11 @@ func (l *StructLogger) CaptureEnd(output []byte, gasUsed uint64, t time.Duration
 	}
 }
 
+func (l *StructLogger) CaptureEnter(typ OpCode, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int) {
+}
+
+func (l *StructLogger) CaptureExit(output []byte, gasUsed uint64, err error) {}
+
 // StructLogs returns the captured log entries.
 func (l *StructLogger) StructLogs() []StructLog { return l.logs }
 
@@ -342,3 +349,8 @@ func (t *mdLogger) CaptureEnd(output []byte, gasUsed uint64, tm time.Duration, e
 	fmt.Fprintf(t.out, "\nOutput: `0x%x`\nConsumed gas: `%d`\nError: `%v`\n",
 		output, gasUsed, err)
 }
+
+func (t *mdLogger) CaptureEnter(typ OpCode, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int) {
+}
+
+func (t *mdLogger) CaptureExit(output []byte, gasUsed uint64, err error) {}

core/vm/logger_json.go

@@ -87,3 +87,8 @@ func (l *JSONLogger) CaptureEnd(output []byte, gasUsed uint64, t time.Duration,
 	}
 	l.encoder.Encode(endLog{common.Bytes2Hex(output), math.HexOrDecimal64(gasUsed), t, errMsg})
 }
+
+func (l *JSONLogger) CaptureEnter(typ OpCode, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int) {
+}
+
+func (l *JSONLogger) CaptureExit(output []byte, gasUsed uint64, err error) {}

core/vm/runtime/runtime_test.go

@@ -33,6 +33,7 @@ import (
 	"github.com/ethereum/go-ethereum/core/state"
 	"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"
 )
 
@@ -342,11 +343,21 @@ func (s *stepCounter) CaptureState(env *vm.EVM, pc uint64, op vm.OpCode, gas, co
 
 // benchmarkNonModifyingCode benchmarks code, but if the code modifies the
 // state, this should not be used, since it does not reset the state between runs.
-func benchmarkNonModifyingCode(gas uint64, code []byte, name string, b *testing.B) {
+func benchmarkNonModifyingCode(gas uint64, code []byte, name string, tracerCode string, b *testing.B) {
 	cfg := new(Config)
 	setDefaults(cfg)
 	cfg.State, _ = state.New(common.Hash{}, state.NewDatabase(rawdb.NewMemoryDatabase()), nil)
 	cfg.GasLimit = gas
+	if len(tracerCode) > 0 {
+		tracer, err := tracers.New(tracerCode, new(tracers.Context))
+		if err != nil {
+			b.Fatal(err)
+		}
+		cfg.EVMConfig = vm.Config{
+			Debug:  true,
+			Tracer: tracer,
+		}
+	}
 	var (
 		destination = common.BytesToAddress([]byte("contract"))
 		vmenv       = NewEnv(cfg)
@@ -486,12 +497,12 @@ func BenchmarkSimpleLoop(b *testing.B) {
 	//		Tracer: tracer,
 	//	}})
 	// 100M gas
-	benchmarkNonModifyingCode(100000000, staticCallIdentity, "staticcall-identity-100M", b)
-	benchmarkNonModifyingCode(100000000, callIdentity, "call-identity-100M", b)
-	benchmarkNonModifyingCode(100000000, loopingCode, "loop-100M", b)
-	benchmarkNonModifyingCode(100000000, callInexistant, "call-nonexist-100M", b)
-	benchmarkNonModifyingCode(100000000, callEOA, "call-EOA-100M", b)
-	benchmarkNonModifyingCode(100000000, calllRevertingContractWithInput, "call-reverting-100M", b)
+	benchmarkNonModifyingCode(100000000, staticCallIdentity, "staticcall-identity-100M", "", b)
+	benchmarkNonModifyingCode(100000000, callIdentity, "call-identity-100M", "", b)
+	benchmarkNonModifyingCode(100000000, loopingCode, "loop-100M", "", b)
+	benchmarkNonModifyingCode(100000000, callInexistant, "call-nonexist-100M", "", b)
+	benchmarkNonModifyingCode(100000000, callEOA, "call-EOA-100M", "", b)
+	benchmarkNonModifyingCode(100000000, calllRevertingContractWithInput, "call-reverting-100M", "", b)
 
 	//benchmarkNonModifyingCode(10000000, staticCallIdentity, "staticcall-identity-10M", b)
 	//benchmarkNonModifyingCode(10000000, loopingCode, "loop-10M", b)
@@ -688,3 +699,241 @@ func TestColdAccountAccessCost(t *testing.T) {
 		}
 	}
 }
+
+func TestRuntimeJSTracer(t *testing.T) {
+	jsTracers := []string{
+		`{enters: 0, exits: 0, enterGas: 0, gasUsed: 0, steps:0,
+	step: function() { this.steps++}, 
+	fault: function() {}, 
+	result: function() { 
+		return [this.enters, this.exits,this.enterGas,this.gasUsed, this.steps].join(",") 
+	}, 
+	enter: function(frame) { 
+		this.enters++; 
+		this.enterGas = frame.getGas();
+	}, 
+	exit: function(res) { 
+		this.exits++; 
+		this.gasUsed = res.getGasUsed();
+	}}`,
+		`{enters: 0, exits: 0, enterGas: 0, gasUsed: 0, steps:0,
+	fault: function() {}, 
+	result: function() { 
+		return [this.enters, this.exits,this.enterGas,this.gasUsed, this.steps].join(",") 
+	}, 
+	enter: function(frame) { 
+		this.enters++; 
+		this.enterGas = frame.getGas();
+	}, 
+	exit: function(res) { 
+		this.exits++; 
+		this.gasUsed = res.getGasUsed();
+	}}`}
+	tests := []struct {
+		code []byte
+		// One result per tracer
+		results []string
+	}{
+		{
+			// CREATE
+			code: []byte{
+				// Store initcode in memory at 0x00 (5 bytes left-padded to 32 bytes)
+				byte(vm.PUSH5),
+				// Init code: PUSH1 0, PUSH1 0, RETURN (3 steps)
+				byte(vm.PUSH1), 0, byte(vm.PUSH1), 0, byte(vm.RETURN),
+				byte(vm.PUSH1), 0,
+				byte(vm.MSTORE),
+				// length, offset, value
+				byte(vm.PUSH1), 5, byte(vm.PUSH1), 27, byte(vm.PUSH1), 0,
+				byte(vm.CREATE),
+				byte(vm.POP),
+			},
+			results: []string{`"1,1,4294935775,6,12"`, `"1,1,4294935775,6,0"`},
+		},
+		{
+			// CREATE2
+			code: []byte{
+				// Store initcode in memory at 0x00 (5 bytes left-padded to 32 bytes)
+				byte(vm.PUSH5),
+				// Init code: PUSH1 0, PUSH1 0, RETURN (3 steps)
+				byte(vm.PUSH1), 0, byte(vm.PUSH1), 0, byte(vm.RETURN),
+				byte(vm.PUSH1), 0,
+				byte(vm.MSTORE),
+				// salt, length, offset, value
+				byte(vm.PUSH1), 1, byte(vm.PUSH1), 5, byte(vm.PUSH1), 27, byte(vm.PUSH1), 0,
+				byte(vm.CREATE2),
+				byte(vm.POP),
+			},
+			results: []string{`"1,1,4294935766,6,13"`, `"1,1,4294935766,6,0"`},
+		},
+		{
+			// CALL
+			code: []byte{
+				// outsize, outoffset, insize, inoffset
+				byte(vm.PUSH1), 0, byte(vm.PUSH1), 0, byte(vm.PUSH1), 0, byte(vm.PUSH1), 0,
+				byte(vm.PUSH1), 0, // value
+				byte(vm.PUSH1), 0xbb, //address
+				byte(vm.GAS), // gas
+				byte(vm.CALL),
+				byte(vm.POP),
+			},
+			results: []string{`"1,1,4294964716,6,13"`, `"1,1,4294964716,6,0"`},
+		},
+		{
+			// CALLCODE
+			code: []byte{
+				// outsize, outoffset, insize, inoffset
+				byte(vm.PUSH1), 0, byte(vm.PUSH1), 0, byte(vm.PUSH1), 0, byte(vm.PUSH1), 0,
+				byte(vm.PUSH1), 0, // value
+				byte(vm.PUSH1), 0xcc, //address
+				byte(vm.GAS), // gas
+				byte(vm.CALLCODE),
+				byte(vm.POP),
+			},
+			results: []string{`"1,1,4294964716,6,13"`, `"1,1,4294964716,6,0"`},
+		},
+		{
+			// STATICCALL
+			code: []byte{
+				// outsize, outoffset, insize, inoffset
+				byte(vm.PUSH1), 0, byte(vm.PUSH1), 0, byte(vm.PUSH1), 0, byte(vm.PUSH1), 0,
+				byte(vm.PUSH1), 0xdd, //address
+				byte(vm.GAS), // gas
+				byte(vm.STATICCALL),
+				byte(vm.POP),
+			},
+			results: []string{`"1,1,4294964719,6,12"`, `"1,1,4294964719,6,0"`},
+		},
+		{
+			// DELEGATECALL
+			code: []byte{
+				// outsize, outoffset, insize, inoffset
+				byte(vm.PUSH1), 0, byte(vm.PUSH1), 0, byte(vm.PUSH1), 0, byte(vm.PUSH1), 0,
+				byte(vm.PUSH1), 0xee, //address
+				byte(vm.GAS), // gas
+				byte(vm.DELEGATECALL),
+				byte(vm.POP),
+			},
+			results: []string{`"1,1,4294964719,6,12"`, `"1,1,4294964719,6,0"`},
+		},
+		{
+			// CALL self-destructing contract
+			code: []byte{
+				// outsize, outoffset, insize, inoffset
+				byte(vm.PUSH1), 0, byte(vm.PUSH1), 0, byte(vm.PUSH1), 0, byte(vm.PUSH1), 0,
+				byte(vm.PUSH1), 0, // value
+				byte(vm.PUSH1), 0xff, //address
+				byte(vm.GAS), // gas
+				byte(vm.CALL),
+				byte(vm.POP),
+			},
+			results: []string{`"2,2,0,5003,12"`, `"2,2,0,5003,0"`},
+		},
+	}
+	calleeCode := []byte{
+		byte(vm.PUSH1), 0,
+		byte(vm.PUSH1), 0,
+		byte(vm.RETURN),
+	}
+	depressedCode := []byte{
+		byte(vm.PUSH1), 0xaa,
+		byte(vm.SELFDESTRUCT),
+	}
+	main := common.HexToAddress("0xaa")
+	for i, jsTracer := range jsTracers {
+		for j, tc := range tests {
+			statedb, _ := state.New(common.Hash{}, state.NewDatabase(rawdb.NewMemoryDatabase()), nil)
+			statedb.SetCode(main, tc.code)
+			statedb.SetCode(common.HexToAddress("0xbb"), calleeCode)
+			statedb.SetCode(common.HexToAddress("0xcc"), calleeCode)
+			statedb.SetCode(common.HexToAddress("0xdd"), calleeCode)
+			statedb.SetCode(common.HexToAddress("0xee"), calleeCode)
+			statedb.SetCode(common.HexToAddress("0xff"), depressedCode)
+
+			tracer, err := tracers.New(jsTracer, new(tracers.Context))
+			if err != nil {
+				t.Fatal(err)
+			}
+			_, _, err = Call(main, nil, &Config{
+				State: statedb,
+				EVMConfig: vm.Config{
+					Debug:  true,
+					Tracer: tracer,
+				}})
+			if err != nil {
+				t.Fatal("didn't expect error", err)
+			}
+			res, err := tracer.GetResult()
+			if err != nil {
+				t.Fatal(err)
+			}
+			if have, want := string(res), tc.results[i]; have != want {
+				t.Errorf("wrong result for tracer %d testcase %d, have \n%v\nwant\n%v\n", i, j, have, want)
+			}
+		}
+	}
+}
+
+func TestJSTracerCreateTx(t *testing.T) {
+	jsTracer := `
+	{enters: 0, exits: 0,
+	step: function() {},
+	fault: function() {},
+	result: function() { return [this.enters, this.exits].join(",") },
+	enter: function(frame) { this.enters++ },
+	exit: function(res) { this.exits++ }}`
+	code := []byte{byte(vm.PUSH1), 0, byte(vm.PUSH1), 0, byte(vm.RETURN)}
+
+	statedb, _ := state.New(common.Hash{}, state.NewDatabase(rawdb.NewMemoryDatabase()), nil)
+	tracer, err := tracers.New(jsTracer, new(tracers.Context))
+	if err != nil {
+		t.Fatal(err)
+	}
+	_, _, _, err = Create(code, &Config{
+		State: statedb,
+		EVMConfig: vm.Config{
+			Debug:  true,
+			Tracer: tracer,
+		}})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	res, err := tracer.GetResult()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if have, want := string(res), `"0,0"`; have != want {
+		t.Errorf("wrong result for tracer, have \n%v\nwant\n%v\n", have, want)
+	}
+}
+
+func BenchmarkTracerStepVsCallFrame(b *testing.B) {
+	// Simply pushes and pops some values in a loop
+	code := []byte{
+		byte(vm.JUMPDEST),
+		byte(vm.PUSH1), 0,
+		byte(vm.PUSH1), 0,
+		byte(vm.POP),
+		byte(vm.POP),
+		byte(vm.PUSH1), 0, // jumpdestination
+		byte(vm.JUMP),
+	}
+
+	stepTracer := `
+	{
+	step: function() {},
+	fault: function() {},
+	result: function() {},
+	}`
+	callFrameTracer := `
+	{
+	enter: function() {},
+	exit: function() {},
+	fault: function() {},
+	result: function() {},
+	}`
+
+	benchmarkNonModifyingCode(10000000, code, "tracer-step-10M", stepTracer, b)
+	benchmarkNonModifyingCode(10000000, code, "tracer-call-frame-10M", callFrameTracer, b)
+}

core/vm/stack.go

@@ -91,7 +91,7 @@ func (st *Stack) Print() {
 	fmt.Println("### stack ###")
 	if len(st.data) > 0 {
 		for i, val := range st.data {
-			fmt.Printf("%-3d  %v\n", i, val)
+			fmt.Printf("%-3d  %s\n", i, val.String())
 		}
 	} else {
 		fmt.Println("-- empty --")

eth/tracers/internal/tracers/call_tracer_legacy.js

+// 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/>.
+
+// callTracer is a full blown transaction tracer that extracts and reports all
+// the internal calls made by a transaction, along with any useful information.
+{
+	// callstack is the current recursive call stack of the EVM execution.
+	callstack: [{}],
+
+	// descended tracks whether we've just descended from an outer transaction into
+	// an inner call.
+	descended: false,
+
+	// step is invoked for every opcode that the VM executes.
+	step: function(log, db) {
+		// Capture any errors immediately
+		var error = log.getError();
+		if (error !== undefined) {
+			this.fault(log, db);
+			return;
+		}
+		// We only care about system opcodes, faster if we pre-check once
+		var syscall = (log.op.toNumber() & 0xf0) == 0xf0;
+		if (syscall) {
+			var op = log.op.toString();
+		}
+		// If a new contract is being created, add to the call stack
+		if (syscall && (op == 'CREATE' || op == "CREATE2")) {
+			var inOff = log.stack.peek(1).valueOf();
+			var inEnd = inOff + log.stack.peek(2).valueOf();
+
+			// Assemble the internal call report and store for completion
+			var call = {
+				type:    op,
+				from:    toHex(log.contract.getAddress()),
+				input:   toHex(log.memory.slice(inOff, inEnd)),
+				gasIn:   log.getGas(),
+				gasCost: log.getCost(),
+				value:   '0x' + log.stack.peek(0).toString(16)
+			};
+			this.callstack.push(call);
+			this.descended = true
+			return;
+		}
+		// If a contract is being self destructed, gather that as a subcall too
+		if (syscall && op == 'SELFDESTRUCT') {
+			var left = this.callstack.length;
+			if (this.callstack[left-1].calls === undefined) {
+				this.callstack[left-1].calls = [];
+			}
+			this.callstack[left-1].calls.push({
+				type:    op,
+				from:    toHex(log.contract.getAddress()),
+				to:      toHex(toAddress(log.stack.peek(0).toString(16))),
+				gasIn:   log.getGas(),
+				gasCost: log.getCost(),
+				value:   '0x' + db.getBalance(log.contract.getAddress()).toString(16)
+			});
+			return
+		}
+		// If a new method invocation is being done, add to the call stack
+		if (syscall && (op == 'CALL' || op == 'CALLCODE' || op == 'DELEGATECALL' || op == 'STATICCALL')) {
+			// Skip any pre-compile invocations, those are just fancy opcodes
+			var to = toAddress(log.stack.peek(1).toString(16));
+			if (isPrecompiled(to)) {
+				return
+			}
+			var off = (op == 'DELEGATECALL' || op == 'STATICCALL' ? 0 : 1);
+
+			var inOff = log.stack.peek(2 + off).valueOf();
+			var inEnd = inOff + log.stack.peek(3 + off).valueOf();
+
+			// Assemble the internal call report and store for completion
+			var call = {
+				type:    op,
+				from:    toHex(log.contract.getAddress()),
+				to:      toHex(to),
+				input:   toHex(log.memory.slice(inOff, inEnd)),
+				gasIn:   log.getGas(),
+				gasCost: log.getCost(),
+				outOff:  log.stack.peek(4 + off).valueOf(),
+				outLen:  log.stack.peek(5 + off).valueOf()
+			};
+			if (op != 'DELEGATECALL' && op != 'STATICCALL') {
+				call.value = '0x' + log.stack.peek(2).toString(16);
+			}
+			this.callstack.push(call);
+			this.descended = true
+			return;
+		}
+		// If we've just descended into an inner call, retrieve it's true allowance. We
+		// need to extract if from within the call as there may be funky gas dynamics
+		// with regard to requested and actually given gas (2300 stipend, 63/64 rule).
+		if (this.descended) {
+			if (log.getDepth() >= this.callstack.length) {
+				this.callstack[this.callstack.length - 1].gas = log.getGas();
+			} else {
+				// TODO(karalabe): The call was made to a plain account. We currently don't
+				// have access to the true gas amount inside the call and so any amount will
+				// mostly be wrong since it depends on a lot of input args. Skip gas for now.
+			}
+			this.descended = false;
+		}
+		// If an existing call is returning, pop off the call stack
+		if (syscall && op == 'REVERT') {
+			this.callstack[this.callstack.length - 1].error = "execution reverted";
+			return;
+		}
+		if (log.getDepth() == this.callstack.length - 1) {
+			// Pop off the last call and get the execution results
+			var call = this.callstack.pop();
+
+			if (call.type == 'CREATE' || call.type == "CREATE2") {
+				// If the call was a CREATE, retrieve the contract address and output code
+				call.gasUsed = '0x' + bigInt(call.gasIn - call.gasCost - log.getGas()).toString(16);
+				delete call.gasIn; delete call.gasCost;
+
+				var ret = log.stack.peek(0);
+				if (!ret.equals(0)) {
+					call.to     = toHex(toAddress(ret.toString(16)));
+					call.output = toHex(db.getCode(toAddress(ret.toString(16))));
+				} else if (call.error === undefined) {
+					call.error = "internal failure"; // TODO(karalabe): surface these faults somehow
+				}
+			} else {
+				// If the call was a contract call, retrieve the gas usage and output
+				if (call.gas !== undefined) {
+					call.gasUsed = '0x' + bigInt(call.gasIn - call.gasCost + call.gas - log.getGas()).toString(16);
+				}
+				var ret = log.stack.peek(0);
+				if (!ret.equals(0)) {
+					call.output = toHex(log.memory.slice(call.outOff, call.outOff + call.outLen));
+				} else if (call.error === undefined) {
+					call.error = "internal failure"; // TODO(karalabe): surface these faults somehow
+				}
+				delete call.gasIn; delete call.gasCost;
+				delete call.outOff; delete call.outLen;
+			}
+			if (call.gas !== undefined) {
+				call.gas = '0x' + bigInt(call.gas).toString(16);
+			}
+			// Inject the call into the previous one
+			var left = this.callstack.length;
+			if (this.callstack[left-1].calls === undefined) {
+				this.callstack[left-1].calls = [];
+			}
+			this.callstack[left-1].calls.push(call);
+		}
+	},
+
+	// fault is invoked when the actual execution of an opcode fails.
+	fault: function(log, db) {
+		// If the topmost call already reverted, don't handle the additional fault again
+		if (this.callstack[this.callstack.length - 1].error !== undefined) {
+			return;
+		}
+		// Pop off the just failed call
+		var call = this.callstack.pop();
+		call.error = log.getError();
+
+		// Consume all available gas and clean any leftovers
+		if (call.gas !== undefined) {
+			call.gas = '0x' + bigInt(call.gas).toString(16);
+			call.gasUsed = call.gas
+		}
+		delete call.gasIn; delete call.gasCost;
+		delete call.outOff; delete call.outLen;
+
+		// Flatten the failed call into its parent
+		var left = this.callstack.length;
+		if (left > 0) {
+			if (this.callstack[left-1].calls === undefined) {
+				this.callstack[left-1].calls = [];
+			}
+			this.callstack[left-1].calls.push(call);
+			return;
+		}
+		// Last call failed too, leave it in the stack
+		this.callstack.push(call);
+	},
+
+	// result is invoked when all the opcodes have been iterated over and returns
+	// the final result of the tracing.
+	result: function(ctx, db) {
+		var result = {
+			type:    ctx.type,
+			from:    toHex(ctx.from),
+			to:      toHex(ctx.to),
+			value:   '0x' + ctx.value.toString(16),
+			gas:     '0x' + bigInt(ctx.gas).toString(16),
+			gasUsed: '0x' + bigInt(ctx.gasUsed).toString(16),
+			input:   toHex(ctx.input),
+			output:  toHex(ctx.output),
+			time:    ctx.time,
+		};
+		if (this.callstack[0].calls !== undefined) {
+			result.calls = this.callstack[0].calls;
+		}
+		if (this.callstack[0].error !== undefined) {
+			result.error = this.callstack[0].error;
+		} else if (ctx.error !== undefined) {
+			result.error = ctx.error;
+		}
+		if (result.error !== undefined && (result.error !== "execution reverted" || result.output ==="0x")) {
+			delete result.output;
+		}
+		return this.finalize(result);
+	},
+
+	// finalize recreates a call object using the final desired field oder for json
+	// serialization. This is a nicety feature to pass meaningfully ordered results
+	// to users who don't interpret it, just display it.
+	finalize: function(call) {
+		var sorted = {
+			type:    call.type,
+			from:    call.from,
+			to:      call.to,
+			value:   call.value,
+			gas:     call.gas,
+			gasUsed: call.gasUsed,
+			input:   call.input,
+			output:  call.output,
+			error:   call.error,
+			time:    call.time,
+			calls:   call.calls,
+		}
+		for (var key in sorted) {
+			if (sorted[key] === undefined) {
+				delete sorted[key];
+			}
+		}
+		if (sorted.calls !== undefined) {
+			for (var i=0; i<sorted.calls.length; i++) {
+				sorted.calls[i] = this.finalize(sorted.calls[i]);
+			}
+		}
+		return sorted;
+	}
+}

eth/tracers/testdata/call_tracer/inner_instafail.json

+{
+  "genesis": {
+    "difficulty": "117067574",
+    "extraData": "0xd783010502846765746887676f312e372e33856c696e7578",
+    "gasLimit": "4712380",
+    "hash": "0xe05db05eeb3f288041ecb10a787df121c0ed69499355716e17c307de313a4486",
+    "miner": "0x0c062b329265c965deef1eede55183b3acb8f611",
+    "mixHash": "0xb669ae39118a53d2c65fd3b1e1d3850dd3f8c6842030698ed846a2762d68b61d",
+    "nonce": "0x2b469722b8e28c45",
+    "number": "24973",
+    "stateRoot": "0x532a5c3f75453a696428db078e32ae283c85cb97e4d8560dbdf022adac6df369",
+    "timestamp": "1479891145",
+    "totalDifficulty": "1892250259406",
+    "alloc": {
+      "0x6c06b16512b332e6cd8293a2974872674716ce18": {
+        "balance": "0x0",
+        "nonce": "1",
+        "code": "0x60606040526000357c0100000000000000000000000000000000000000000000000000000000900480632e1a7d4d146036575b6000565b34600057604e60048080359060200190919050506050565b005b3373ffffffffffffffffffffffffffffffffffffffff166108fc829081150290604051809050600060405180830381858888f19350505050505b5056",
+        "storage": {}
+      },
+      "0x66fdfd05e46126a07465ad24e40cc0597bc1ef31": {
+        "balance": "0x229ebbb36c3e0f20",
+        "nonce": "3",
+        "code": "0x",
+        "storage": {}
+      }
+    },
+    "config": {
+      "chainId": 3,
+      "homesteadBlock": 0,
+      "daoForkSupport": true,
+      "eip150Block": 0,
+      "eip150Hash": "0x41941023680923e0fe4d74a34bdac8141f2540e3ae90623718e47d66d1ca4a2d",
+      "eip155Block": 10,
+      "eip158Block": 10,
+      "byzantiumBlock": 1700000,
+      "constantinopleBlock": 4230000,
+      "petersburgBlock": 4939394,
+      "istanbulBlock": 6485846,
+      "muirGlacierBlock": 7117117,
+      "ethash": {}
+    }
+  },
+  "context": {
+    "number": "24974",
+    "difficulty": "117067574",
+    "timestamp": "1479891162",
+    "gasLimit": "4712388",
+    "miner": "0xc822ef32e6d26e170b70cf761e204c1806265914"
+  },
+  "input": "0xf889038504a81557008301f97e946c06b16512b332e6cd8293a2974872674716ce1880a42e1a7d4d00000000000000000000000000000000000000000000000014d1120d7b1600002aa0e2a6558040c5d72bc59f2fb62a38993a314c849cd22fb393018d2c5af3112095a01bdb6d7ba32263ccc2ecc880d38c49d9f0c5a72d8b7908e3122b31356d349745",
+  "result": {
+    "type": "CALL",
+    "from": "0x66fdfd05e46126a07465ad24e40cc0597bc1ef31",
+    "to": "0x6c06b16512b332e6cd8293a2974872674716ce18",
+    "value": "0x0",
+    "gas": "0x1a466",
+    "gasUsed": "0x1dc6",
+    "input": "0x2e1a7d4d00000000000000000000000000000000000000000000000014d1120d7b160000",
+    "output": "0x",
+    "calls": []
+  }
+}

eth/tracers/testdata/call_tracer/selfdestruct.json

+{
+  "context": {
+    "difficulty": "3502894804",
+    "gasLimit": "4722976",
+    "miner": "0x1585936b53834b021f68cc13eeefdec2efc8e724",
+    "number": "2289806",
+    "timestamp": "1513601314"
+  },
+  "genesis": {
+    "alloc": {
+      "0x0024f658a46fbb89d8ac105e98d7ac7cbbaf27c5": {
+        "balance": "0x0",
+        "code": "0x",
+        "nonce": "22",
+        "storage": {}
+      },
+      "0x3b873a919aa0512d5a0f09e6dcceaa4a6727fafe": {
+        "balance": "0x4d87094125a369d9bd5",
+        "code": "0x61deadff",
+        "nonce": "1",
+        "storage": {}
+      },
+      "0xb436ba50d378d4bbc8660d312a13df6af6e89dfb": {
+        "balance": "0x1780d77678137ac1b775",
+        "code": "0x",
+        "nonce": "29072",
+        "storage": {}
+      }
+    },
+    "config": {
+      "byzantiumBlock": 1700000,
+      "chainId": 3,
+      "daoForkSupport": true,
+      "eip150Block": 0,
+      "eip150Hash": "0x41941023680923e0fe4d74a34bdac8141f2540e3ae90623718e47d66d1ca4a2d",
+      "eip155Block": 10,
+      "eip158Block": 10,
+      "ethash": {},
+      "homesteadBlock": 0
+    },
+    "difficulty": "3509749784",
+    "extraData": "0x4554482e45544846414e532e4f52472d4641313738394444",
+    "gasLimit": "4727564",
+    "hash": "0x609948ac3bd3c00b7736b933248891d6c901ee28f066241bddb28f4e00a9f440",
+    "miner": "0xbbf5029fd710d227630c8b7d338051b8e76d50b3",
+    "mixHash": "0xb131e4507c93c7377de00e7c271bf409ec7492767142ff0f45c882f8068c2ada",
+    "nonce": "0x4eb12e19c16d43da",
+    "number": "2289805",
+    "stateRoot": "0xc7f10f352bff82fac3c2999d3085093d12652e19c7fd32591de49dc5d91b4f1f",
+    "timestamp": "1513601261",
+    "totalDifficulty": "7143276353481064"
+  },
+  "input": "0xf88b8271908506fc23ac0083015f90943b873a919aa0512d5a0f09e6dcceaa4a6727fafe80a463e4bff40000000000000000000000000024f658a46fbb89d8ac105e98d7ac7cbbaf27c52aa0bdce0b59e8761854e857fe64015f06dd08a4fbb7624f6094893a79a72e6ad6bea01d9dde033cff7bb235a3163f348a6d7ab8d6b52bc0963a95b91612e40ca766a4",
+  "result": {
+    "calls": [
+      {
+        "from": "0x3b873a919aa0512d5a0f09e6dcceaa4a6727fafe",
+        "gas": "0x0",
+        "gasUsed": "0x0",
+        "input": "0x",
+        "to": "0x000000000000000000000000000000000000dEaD",
+        "type": "SELFDESTRUCT",
+        "value": "0x4d87094125a369d9bd5"
+      }
+    ],
+    "from": "0xb436ba50d378d4bbc8660d312a13df6af6e89dfb",
+    "gas": "0x10738",
+    "gasUsed": "0x7533",
+    "input": "0x63e4bff40000000000000000000000000024f658a46fbb89d8ac105e98d7ac7cbbaf27c5",
+    "output": "0x",
+    "to": "0x3b873a919aa0512d5a0f09e6dcceaa4a6727fafe",
+    "type": "CALL",
+    "value": "0x0"
+  }
+}

eth/tracers/testdata/call_tracer/simple.json

+{
+  "context": {
+    "difficulty": "3502894804",
+    "gasLimit": "4722976",
+    "miner": "0x1585936b53834b021f68cc13eeefdec2efc8e724",
+    "number": "2289806",
+    "timestamp": "1513601314"
+  },
+  "genesis": {
+    "alloc": {
+      "0x0024f658a46fbb89d8ac105e98d7ac7cbbaf27c5": {
+        "balance": "0x0",
+        "code": "0x",
+        "nonce": "22",
+        "storage": {}
+      },
+      "0x3b873a919aa0512d5a0f09e6dcceaa4a6727fafe": {
+        "balance": "0x4d87094125a369d9bd5",
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+          "0x0000000000000000000000000000000000000000000000000000000000000001": "0x00000000000000000000000000000000000000000000000006f05b59d3b20000",
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+      "0xb436ba50d378d4bbc8660d312a13df6af6e89dfb": {
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+        "code": "0x",
+        "nonce": "29072",
+        "storage": {}
+      }
+    },
+    "config": {
+      "byzantiumBlock": 1700000,
+      "chainId": 3,
+      "daoForkSupport": true,
+      "eip150Block": 0,
+      "eip150Hash": "0x41941023680923e0fe4d74a34bdac8141f2540e3ae90623718e47d66d1ca4a2d",
+      "eip155Block": 10,
+      "eip158Block": 10,
+      "ethash": {},
+      "homesteadBlock": 0
+    },
+    "difficulty": "3509749784",
+    "extraData": "0x4554482e45544846414e532e4f52472d4641313738394444",
+    "gasLimit": "4727564",
+    "hash": "0x609948ac3bd3c00b7736b933248891d6c901ee28f066241bddb28f4e00a9f440",
+    "miner": "0xbbf5029fd710d227630c8b7d338051b8e76d50b3",
+    "mixHash": "0xb131e4507c93c7377de00e7c271bf409ec7492767142ff0f45c882f8068c2ada",
+    "nonce": "0x4eb12e19c16d43da",
+    "number": "2289805",
+    "stateRoot": "0xc7f10f352bff82fac3c2999d3085093d12652e19c7fd32591de49dc5d91b4f1f",
+    "timestamp": "1513601261",
+    "totalDifficulty": "7143276353481064"
+  },
+  "input": "0xf88b8271908506fc23ac0083015f90943b873a919aa0512d5a0f09e6dcceaa4a6727fafe80a463e4bff40000000000000000000000000024f658a46fbb89d8ac105e98d7ac7cbbaf27c52aa0bdce0b59e8761854e857fe64015f06dd08a4fbb7624f6094893a79a72e6ad6bea01d9dde033cff7bb235a3163f348a6d7ab8d6b52bc0963a95b91612e40ca766a4",
+  "result": {
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+      {
+        "from": "0x3b873a919aa0512d5a0f09e6dcceaa4a6727fafe",
+        "gas": "0x6d05",
+        "gasUsed": "0x0",
+        "input": "0x",
+        "to": "0x0024f658a46fbb89d8ac105e98d7ac7cbbaf27c5",
+        "type": "CALL",
+        "value": "0x6f05b59d3b20000"
+      }
+    ],
+    "from": "0xb436ba50d378d4bbc8660d312a13df6af6e89dfb",
+    "gas": "0x10738",
+    "gasUsed": "0x3ef9",
+    "input": "0x63e4bff40000000000000000000000000024f658a46fbb89d8ac105e98d7ac7cbbaf27c5",
+    "output": "0x0000000000000000000000000000000000000000000000000000000000000001",
+    "to": "0x3b873a919aa0512d5a0f09e6dcceaa4a6727fafe",
+    "type": "CALL",
+    "value": "0x0"
+  }
+}

eth/tracers/testdata/call_tracer_legacy/oog.json

+{
+  "context": {
+    "difficulty": "3699098917",
+    "gasLimit": "5258985",
+    "miner": "0xd049bfd667cb46aa3ef5df0da3e57db3be39e511",
+    "number": "2294631",
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+        "nonce": "1",
+        "storage": {
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+        }
+      },
+      "0x94194bc2aaf494501d7880b61274a169f6502a54": {
+        "balance": "0xea8c39a876d19888d",
+        "code": "0x",
+        "nonce": "265",
+        "storage": {}
+      }
+    },
+    "config": {
+      "byzantiumBlock": 1700000,
+      "chainId": 3,
+      "daoForkSupport": true,
+      "eip150Block": 0,
+      "eip150Hash": "0x41941023680923e0fe4d74a34bdac8141f2540e3ae90623718e47d66d1ca4a2d",
+      "eip155Block": 10,
+      "eip158Block": 10,
+      "ethash": {},
+      "homesteadBlock": 0
+    },
+    "difficulty": "3699098917",
+    "extraData": "0x4554482e45544846414e532e4f52472d4641313738394444",
+    "gasLimit": "5263953",
+    "hash": "0x03a0f62a8106793dafcfae7b75fd2654322062d585a19cea568314d7205790dc",
+    "miner": "0xbbf5029fd710d227630c8b7d338051b8e76d50b3",
+    "mixHash": "0x15482cc64b7c00a947f5bf015dfc010db1a6a668c74df61974d6a7848c174408",
+    "nonce": "0xd1bdb150f6fd170e",
+    "number": "2294630",
+    "stateRoot": "0x1ab1a534e84cc787cda1db21e0d5920ab06017948075b759166cfea7274657a1",
+    "timestamp": "1513675347",
+    "totalDifficulty": "7160543502214733"
+  },
+  "input": "0xf8ab820109855d21dba00082ca1d9443064693d3d38ad6a7cb579e0d6d9718c8aa6b6280b844a9059cbb000000000000000000000000e77b1ac803616503510bed0086e3a7be2627a69900000000000000000000000000000000000000000000000000000009502f90001ba0ce3ad83f5530136467b7c2bb225f406bd170f4ad59c254e5103c34eeabb5bd69a0455154527224a42ab405cacf0fe92918a75641ce4152f8db292019a5527aa956",
+  "result": {
+    "error": "out of gas",
+    "from": "0x94194bc2aaf494501d7880b61274a169f6502a54",
+    "gas": "0x7045",
+    "gasUsed": "0x7045",
+    "input": "0xa9059cbb000000000000000000000000e77b1ac803616503510bed0086e3a7be2627a69900000000000000000000000000000000000000000000000000000009502f9000",
+    "to": "0x43064693d3d38ad6a7cb579e0d6d9718c8aa6b62",
+    "type": "CALL",
+    "value": "0x0"
+  }
+}

eth/tracers/testdata/call_tracer_legacy/revert.json

+{
+  "context": {
+    "difficulty": "3665057456",
+    "gasLimit": "5232723",
+    "miner": "0xf4d8e706cfb25c0decbbdd4d2e2cc10c66376a3f",
+    "number": "2294501",
+    "timestamp": "1513673601"
+  },
+  "genesis": {
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+        "code": "0x",
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+      },
+      "0xabbcd5b340c80b5f1c0545c04c987b87310296ae": {
+        "balance": "0x0",
+        "code": "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",
+        "nonce": "1",
+        "storage": {}
+      }
+    },
+    "config": {
+      "byzantiumBlock": 1700000,
+      "chainId": 3,
+      "daoForkSupport": true,
+      "eip150Block": 0,
+      "eip150Hash": "0x41941023680923e0fe4d74a34bdac8141f2540e3ae90623718e47d66d1ca4a2d",
+      "eip155Block": 10,
+      "eip158Block": 10,
+      "ethash": {},
+      "homesteadBlock": 0
+    },
+    "difficulty": "3672229776",
+    "extraData": "0x4554482e45544846414e532e4f52472d4641313738394444",
+    "gasLimit": "5227619",
+    "hash": "0xa07b3d6c6bf63f5f981016db9f2d1d93033833f2c17e8bf7209e85f1faf08076",
+    "miner": "0xbbf5029fd710d227630c8b7d338051b8e76d50b3",
+    "mixHash": "0x806e151ce2817be922e93e8d5921fa0f0d0fd213d6b2b9a3fa17458e74a163d0",
+    "nonce": "0xbc5d43adc2c30c7d",
+    "number": "2294500",
+    "stateRoot": "0xca645b335888352ef9d8b1ef083e9019648180b259026572e3139717270de97d",
+    "timestamp": "1513673552",
+    "totalDifficulty": "7160066586979149"
+  },
+  "input": "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",
+  "result": {
+    "error": "execution reverted",
+    "from": "0x0f6cef2b7fbb504782e35aa82a2207e816a2b7a9",
+    "gas": "0x2d55e8",
+    "gasUsed": "0xc3",
+    "input": "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",
+    "to": "0xabbcd5b340c80b5f1c0545c04c987b87310296ae",
+    "type": "CALL",
+    "value": "0x0"
+  }
+}

eth/tracers/testdata/call_tracer_legacy/revert_reason.json

+{
+  "context": {
+    "difficulty": "2",
+    "gasLimit": "8000000",
+    "miner": "0x0000000000000000000000000000000000000000",
+    "number": "3212651",
+    "timestamp": "1597246515"
+  },
+  "genesis": {
+    "alloc": {
+      "0xf58833cf0c791881b494eb79d461e08a1f043f52": {
+        "balance": "0x0",
+        "code": "0x608060405234801561001057600080fd5b50600436106100a5576000357c010000000000000000000000000000000000000000000000000000000090048063609ff1bd11610078578063609ff1bd146101af5780639e7b8d61146101cd578063a3ec138d14610211578063e2ba53f0146102ae576100a5565b80630121b93f146100aa578063013cf08b146100d85780632e4176cf146101215780635c19a95c1461016b575b600080fd5b6100d6600480360360208110156100c057600080fd5b81019080803590602001909291905050506102cc565b005b610104600480360360208110156100ee57600080fd5b8101908080359060200190929190505050610469565b604051808381526020018281526020019250505060405180910390f35b61012961049a565b604051808273ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff16815260200191505060405180910390f35b6101ad6004803603602081101561018157600080fd5b81019080803573ffffffffffffffffffffffffffffffffffffffff1690602001909291905050506104bf565b005b6101b76108db565b6040518082815260200191505060405180910390f35b61020f600480360360208110156101e357600080fd5b81019080803573ffffffffffffffffffffffffffffffffffffffff169060200190929190505050610952565b005b6102536004803603602081101561022757600080fd5b81019080803573ffffffffffffffffffffffffffffffffffffffff169060200190929190505050610b53565b60405180858152602001841515151581526020018373ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff16815260200182815260200194505050505060405180910390f35b6102b6610bb0565b6040518082815260200191505060405180910390f35b6000600160003373ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff168152602001908152602001600020905060008160000154141561038a576040517f08c379a00000000000000000000000000000000000000000000000000000000081526004018080602001828103825260148152602001807f486173206e6f20726967687420746f20766f746500000000000000000000000081525060200191505060405180910390fd5b8060010160009054906101000a900460ff161561040f576040517f08c379a000000000000000000000000000000000000000000000000000000000815260040180806020018281038252600e8152602001807f416c726561647920766f7465642e00000000000000000000000000000000000081525060200191505060405180910390fd5b60018160010160006101000a81548160ff02191690831515021790555081816002018190555080600001546002838154811061044757fe5b9060005260206000209060020201600101600082825401925050819055505050565b6002818154811061047657fe5b90600052602060002090600202016000915090508060000154908060010154905082565b6000809054906101000a900473ffffffffffffffffffffffffffffffffffffffff1681565b6000600160003373ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff16815260200190815260200160002090508060010160009054906101000a900460ff1615610587576040517f08c379a00000000000000000000000000000000000000000000000000000000081526004018080602001828103825260128152602001807f596f7520616c726561647920766f7465642e000000000000000000000000000081525060200191505060405180910390fd5b3373ffffffffffffffffffffffffffffffffffffffff168273ffffffffffffffffffffffffffffffffffffffff161415610629576040517f08c379a000000000000000000000000000000000000000000000000000000000815260040180806020018281038252601e8152602001807f53656c662d64656c65676174696f6e20697320646973616c6c6f7765642e000081525060200191505060405180910390fd5b5b600073ffffffffffffffffffffffffffffffffffffffff16600160008473ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff16815260200190815260200160002060010160019054906101000a900473ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff16146107cc57600160008373ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff16815260200190815260200160002060010160019054906101000a900473ffffffffffffffffffffffffffffffffffffffff1691503373ffffffffffffffffffffffffffffffffffffffff168273ffffffffffffffffffffffffffffffffffffffff1614156107c7576040517f08c379a00000000000000000000000000000000000000000000000000000000081526004018080602001828103825260198152602001807f466f756e64206c6f6f7020696e2064656c65676174696f6e2e0000000000000081525060200191505060405180910390fd5b61062a565b60018160010160006101000a81548160ff021916908315150217905550818160010160016101000a81548173ffffffffffffffffffffffffffffffffffffffff021916908373ffffffffffffffffffffffffffffffffffffffff1602179055506000600160008473ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff16815260200190815260200160002090508060010160009054906101000a900460ff16156108bf578160000154600282600201548154811061089c57fe5b9060005260206000209060020201600101600082825401925050819055506108d6565b816000015481600001600082825401925050819055505b505050565b6000806000905060008090505b60028054905081101561094d57816002828154811061090357fe5b9060005260206000209060020201600101541115610940576002818154811061092857fe5b90600052602060002090600202016001015491508092505b80806001019150506108e8565b505090565b6000809054906101000a900473ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff163373ffffffffffffffffffffffffffffffffffffffff16146109f7576040517f08c379a0000000000000000000000000000000000000000000000000000000008152600401808060200182810382526028815260200180610bde6028913960400191505060405180910390fd5b600160008273ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff16815260200190815260200160002060010160009054906101000a900460ff1615610aba576040517f08c379a00000000000000000000000000000000000000000000000000000000081526004018080602001828103825260188152602001807f54686520766f74657220616c726561647920766f7465642e000000000000000081525060200191505060405180910390fd5b6000600160008373ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff1681526020019081526020016000206000015414610b0957600080fd5b60018060008373ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff1681526020019081526020016000206000018190555050565b60016020528060005260406000206000915090508060000154908060010160009054906101000a900460ff16908060010160019054906101000a900473ffffffffffffffffffffffffffffffffffffffff16908060020154905084565b60006002610bbc6108db565b81548110610bc657fe5b90600052602060002090600202016000015490509056fe4f6e6c79206368616972706572736f6e2063616e206769766520726967687420746f20766f74652ea26469706673582212201d282819f8f06fed792100d60a8b08809b081a34a1ecd225e83a4b41122165ed64736f6c63430006060033",
+        "nonce": "1",
+        "storage": {
+          "0x6200beec95762de01ce05f2a0e58ce3299dbb53c68c9f3254a242121223cdf58": "0x0000000000000000000000000000000000000000000000000000000000000000"
+        }
+      },
+      "0xf7579c3d8a669c89d5ed246a22eb6db8f6fedbf1": {
+        "balance": "0x57af9d6b3df812900",
+        "code": "0x",
+        "nonce": "6",
+        "storage": {}
+      }
+    },
+    "config": {
+      "byzantiumBlock": 0,
+      "constantinopleBlock": 0,
+      "petersburgBlock": 0,
+      "IstanbulBlock":1561651,
+      "chainId": 5,
+      "daoForkSupport": true,
+      "eip150Block": 0,
+      "eip150Hash": "0x0000000000000000000000000000000000000000000000000000000000000000",
+      "eip155Block": 10,
+      "eip158Block": 10,
+      "ethash": {},
+      "homesteadBlock": 0
+    },
+    "difficulty": "3509749784",
+    "extraData": "0x4554482e45544846414e532e4f52472d4641313738394444",
+    "gasLimit": "4727564",
+    "hash": "0x609948ac3bd3c00b7736b933248891d6c901ee28f066241bddb28f4e00a9f440",
+    "miner": "0xbbf5029fd710d227630c8b7d338051b8e76d50b3",
+    "mixHash": "0xb131e4507c93c7377de00e7c271bf409ec7492767142ff0f45c882f8068c2ada",
+    "nonce": "0x4eb12e19c16d43da",
+    "number": "2289805",
+    "stateRoot": "0xc7f10f352bff82fac3c2999d3085093d12652e19c7fd32591de49dc5d91b4f1f",
+    "timestamp": "1513601261",
+    "totalDifficulty": "7143276353481064"
+  },
+  "input": "0xf888068449504f80832dc6c094f58833cf0c791881b494eb79d461e08a1f043f5280a45c19a95c000000000000000000000000f7579c3d8a669c89d5ed246a22eb6db8f6fedbf12da0264664db3e71fae1dbdaf2f53954be149ad3b7ba8a5054b4d89c70febfacc8b1a0212e8398757963f419681839ae8c5a54b411e252473c82d93dda68405ca63294",
+  "result": {
+    "error": "execution reverted",
+    "from": "0xf7579c3d8a669c89d5ed246a22eb6db8f6fedbf1",
+    "gas": "0x2d7308",
+    "gasUsed": "0x588",
+    "input": "0x5c19a95c000000000000000000000000f7579c3d8a669c89d5ed246a22eb6db8f6fedbf1",
+    "to": "0xf58833cf0c791881b494eb79d461e08a1f043f52",
+    "type": "CALL",
+    "value": "0x0",
+    "output": "0x08c379a00000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000001e53656c662d64656c65676174696f6e20697320646973616c6c6f7765642e0000"
+  }
+}

eth/tracers/testdata/call_tracer_legacy/selfdestruct.json

+{
+  "context": {
+    "difficulty": "3502894804",
+    "gasLimit": "4722976",
+    "miner": "0x1585936b53834b021f68cc13eeefdec2efc8e724",
+    "number": "2289806",
+    "timestamp": "1513601314"
+  },
+  "genesis": {
+    "alloc": {
+      "0x0024f658a46fbb89d8ac105e98d7ac7cbbaf27c5": {
+        "balance": "0x0",
+        "code": "0x",
+        "nonce": "22",
+        "storage": {}
+      },
+      "0x3b873a919aa0512d5a0f09e6dcceaa4a6727fafe": {
+        "balance": "0x4d87094125a369d9bd5",
+        "code": "0x61deadff",
+        "nonce": "1",
+        "storage": {}
+      },
+      "0xb436ba50d378d4bbc8660d312a13df6af6e89dfb": {
+        "balance": "0x1780d77678137ac1b775",
+        "code": "0x",
+        "nonce": "29072",
+        "storage": {}
+      }
+    },
+    "config": {
+      "byzantiumBlock": 1700000,
+      "chainId": 3,
+      "daoForkSupport": true,
+      "eip150Block": 0,
+      "eip150Hash": "0x41941023680923e0fe4d74a34bdac8141f2540e3ae90623718e47d66d1ca4a2d",
+      "eip155Block": 10,
+      "eip158Block": 10,
+      "ethash": {},
+      "homesteadBlock": 0
+    },
+    "difficulty": "3509749784",
+    "extraData": "0x4554482e45544846414e532e4f52472d4641313738394444",
+    "gasLimit": "4727564",
+    "hash": "0x609948ac3bd3c00b7736b933248891d6c901ee28f066241bddb28f4e00a9f440",
+    "miner": "0xbbf5029fd710d227630c8b7d338051b8e76d50b3",
+    "mixHash": "0xb131e4507c93c7377de00e7c271bf409ec7492767142ff0f45c882f8068c2ada",
+    "nonce": "0x4eb12e19c16d43da",
+    "number": "2289805",
+    "stateRoot": "0xc7f10f352bff82fac3c2999d3085093d12652e19c7fd32591de49dc5d91b4f1f",
+    "timestamp": "1513601261",
+    "totalDifficulty": "7143276353481064"
+  },
+  "input": "0xf88b8271908506fc23ac0083015f90943b873a919aa0512d5a0f09e6dcceaa4a6727fafe80a463e4bff40000000000000000000000000024f658a46fbb89d8ac105e98d7ac7cbbaf27c52aa0bdce0b59e8761854e857fe64015f06dd08a4fbb7624f6094893a79a72e6ad6bea01d9dde033cff7bb235a3163f348a6d7ab8d6b52bc0963a95b91612e40ca766a4",
+  "result": {
+    "calls": [
+      {
+        "from": "0x3b873a919aa0512d5a0f09e6dcceaa4a6727fafe",
+        "input": "0x",
+        "to": "0x000000000000000000000000000000000000dEaD",
+        "type": "SELFDESTRUCT",
+        "value": "0x4d87094125a369d9bd5"
+      }
+    ],
+    "from": "0xb436ba50d378d4bbc8660d312a13df6af6e89dfb",
+    "gas": "0x10738",
+    "gasUsed": "0x7533",
+    "input": "0x63e4bff40000000000000000000000000024f658a46fbb89d8ac105e98d7ac7cbbaf27c5",
+    "output": "0x",
+    "to": "0x3b873a919aa0512d5a0f09e6dcceaa4a6727fafe",
+    "type": "CALL",
+    "value": "0x0"
+  }
+}

eth/tracers/tracer.go

@@ -284,6 +284,85 @@ func (cw *contractWrapper) pushObject(vm *duktape.Context) {
 	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")
+}
+
 // Tracer provides an implementation of Tracer that evaluates a Javascript
 // function for each VM execution step.
 type Tracer struct {
@@ -305,6 +384,9 @@ type Tracer struct {
 	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
 
@@ -312,6 +394,8 @@ type Tracer struct {
 	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
@@ -343,6 +427,8 @@ func New(code string, ctx *Context) (*Tracer, error) {
 		costValue:       new(uint),
 		depthValue:      new(uint),
 		refundValue:     new(uint),
+		frame:           newFrame(),
+		frameResult:     newFrameResult(),
 	}
 	if ctx.BlockHash != (common.Hash{}) {
 		tracer.ctx["blockHash"] = ctx.BlockHash
@@ -450,9 +536,7 @@ func New(code string, ctx *Context) (*Tracer, error) {
 	}
 	tracer.tracerObject = 0 // yeah, nice, eval can't return the index itself
 
-	if !tracer.vm.GetPropString(tracer.tracerObject, "step") {
-		return nil, fmt.Errorf("trace object must expose a function step()")
-	}
+	hasStep := tracer.vm.GetPropString(tracer.tracerObject, "step")
 	tracer.vm.Pop()
 
 	if !tracer.vm.GetPropString(tracer.tracerObject, "fault") {
@@ -465,6 +549,23 @@ func New(code string, ctx *Context) (*Tracer, error) {
 	}
 	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()")
+	}
+	if !hasStep {
+		// If there's no step function, the enter and exit must be present
+		if !hasEnter {
+			return nil, fmt.Errorf("trace object must expose either step() or both enter() and exit()")
+		}
+	}
+	tracer.traceCallFrames = hasEnter
+	tracer.traceSteps = hasStep
+
 	// Tracer is valid, inject the big int library to access large numbers
 	tracer.vm.EvalString(bigIntegerJS)
 	tracer.vm.PutGlobalString("bigInt")
@@ -513,6 +614,12 @@ func New(code string, ctx *Context) (*Tracer, error) {
 
 	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")
 
@@ -594,6 +701,9 @@ func (jst *Tracer) CaptureStart(env *vm.EVM, from common.Address, to common.Addr
 
 // CaptureState implements the Tracer interface to trace a single step of VM execution.
 func (jst *Tracer) 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
 	}
@@ -650,41 +760,70 @@ func (jst *Tracer) CaptureEnd(output []byte, gasUsed uint64, t time.Duration, er
 	}
 }
 
-// GetResult calls the Javascript 'result' function and returns its value, or any accumulated error
-func (jst *Tracer) 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 {
-		switch val := val.(type) {
-		case uint64:
-			jst.vm.PushUint(uint(val))
+// CaptureEnter is called when EVM enters a new scope (via call, create or selfdestruct).
+func (jst *Tracer) 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
+	}
 
-		case string:
-			jst.vm.PushString(val)
+	*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())
+	}
 
-		case []byte:
-			ptr := jst.vm.PushFixedBuffer(len(val))
-			copy(makeSlice(ptr, uint(len(val))), val)
+	if _, err := jst.call(true, "enter", "frame"); err != nil {
+		jst.err = wrapError("enter", err)
+	}
+}
 
-		case common.Address:
-			ptr := jst.vm.PushFixedBuffer(20)
-			copy(makeSlice(ptr, 20), val[:])
+// CaptureExit is called when EVM exits a scope, even if the scope didn't
+// execute any code.
+func (jst *Tracer) CaptureExit(output []byte, gasUsed uint64, err error) {
+	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
+	}
 
-		case *big.Int:
-			pushBigInt(val, jst.vm)
+	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()
+	}
 
-		case int:
-			jst.vm.PushInt(val)
+	if _, err := jst.call(true, "exit", "frameResult"); err != nil {
+		jst.err = wrapError("exit", err)
+	}
+}
 
-		case common.Hash:
-			ptr := jst.vm.PushFixedBuffer(32)
-			copy(makeSlice(ptr, 32), val[:])
+// GetResult calls the Javascript 'result' function and returns its value, or any accumulated error
+func (jst *Tracer) GetResult() (json.RawMessage, error) {
+	// Transform the context into a JavaScript object and inject into the state
+	obj := jst.vm.PushObject()
 
-		default:
-			panic(fmt.Sprintf("unsupported type: %T", val))
-		}
-		jst.vm.PutPropString(obj, key)
+	for key, val := range jst.ctx {
+		jst.addToObj(obj, key, val)
 	}
 	jst.vm.PutPropString(jst.stateObject, "ctx")
 
@@ -699,3 +838,35 @@ func (jst *Tracer) GetResult() (json.RawMessage, error) {
 
 	return result, jst.err
 }
+
+// addToObj pushes a field to a JS object.
+func (jst *Tracer) 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

@@ -236,3 +236,35 @@ func TestIsPrecompile(t *testing.T) {
 		t.Errorf("Tracer should consider blake2f as precompile in istanbul")
 	}
 }
+
+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 {
+		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 {
+		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))
+	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)
+
+	have, err := tracer.GetResult()
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := `{"enters":1,"exits":1,"enterGas":1000,"gasUsed":400}`
+	if string(have) != want {
+		t.Errorf("Number of invocations of enter() and exit() is wrong. Have %s, want %s\n", have, want)
+	}
+}

eth/tracers/tracers_test.go

@@ -203,21 +203,25 @@ func TestPrestateTracerCreate2(t *testing.T) {
 
 // Iterates over all the input-output datasets in the tracer test harness and
 // runs the JavaScript tracers against them.
-func TestCallTracer(t *testing.T) {
-	files, err := ioutil.ReadDir("testdata")
+func TestCallTracerLegacy(t *testing.T) {
+	testCallTracer("callTracerLegacy", "call_tracer_legacy", t)
+}
+
+func testCallTracer(tracer string, dirPath string, t *testing.T) {
+	files, err := ioutil.ReadDir(filepath.Join("testdata", dirPath))
 	if err != nil {
 		t.Fatalf("failed to retrieve tracer test suite: %v", err)
 	}
 	for _, file := range files {
-		if !strings.HasPrefix(file.Name(), "call_tracer_") {
+		if !strings.HasSuffix(file.Name(), ".json") {
 			continue
 		}
 		file := file // capture range variable
-		t.Run(camel(strings.TrimSuffix(strings.TrimPrefix(file.Name(), "call_tracer_"), ".json")), func(t *testing.T) {
+		t.Run(camel(strings.TrimSuffix(file.Name(), ".json")), func(t *testing.T) {
 			t.Parallel()
 
 			// Call tracer test found, read if from disk
-			blob, err := ioutil.ReadFile(filepath.Join("testdata", file.Name()))
+			blob, err := ioutil.ReadFile(filepath.Join("testdata", dirPath, file.Name()))
 			if err != nil {
 				t.Fatalf("failed to read testcase: %v", err)
 			}
@@ -248,7 +252,7 @@ func TestCallTracer(t *testing.T) {
 			_, statedb := tests.MakePreState(rawdb.NewMemoryDatabase(), test.Genesis.Alloc, false)
 
 			// Create the tracer, the EVM environment and run it
-			tracer, err := New("callTracer", new(Context))
+			tracer, err := New(tracer, new(Context))
 			if err != nil {
 				t.Fatalf("failed to create call tracer: %v", err)
 			}
@@ -283,6 +287,10 @@ func TestCallTracer(t *testing.T) {
 	}
 }
 
+func TestCallTracer(t *testing.T) {
+	testCallTracer("callTracer", "call_tracer", t)
+}
+
 // jsonEqual is similar to reflect.DeepEqual, but does a 'bounce' via json prior to
 // comparison
 func jsonEqual(x, y interface{}) bool {
@@ -378,3 +386,73 @@ func BenchmarkTransactionTrace(b *testing.B) {
 		tracer.Reset()
 	}
 }
+
+func BenchmarkTracers(b *testing.B) {
+	files, err := ioutil.ReadDir(filepath.Join("testdata", "call_tracer"))
+	if err != nil {
+		b.Fatalf("failed to retrieve tracer test suite: %v", err)
+	}
+	for _, file := range files {
+		if !strings.HasSuffix(file.Name(), ".json") {
+			continue
+		}
+		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()))
+			if err != nil {
+				b.Fatalf("failed to read testcase: %v", err)
+			}
+			test := new(callTracerTest)
+			if err := json.Unmarshal(blob, test); err != nil {
+				b.Fatalf("failed to parse testcase: %v", err)
+			}
+			benchTracer("callTracer", test, b)
+		})
+	}
+}
+
+func benchTracer(tracerName string, test *callTracerTest, b *testing.B) {
+	// Configure a blockchain with the given prestate
+	tx := new(types.Transaction)
+	if err := rlp.DecodeBytes(common.FromHex(test.Input), tx); err != nil {
+		b.Fatalf("failed to parse testcase input: %v", err)
+	}
+	signer := types.MakeSigner(test.Genesis.Config, new(big.Int).SetUint64(uint64(test.Context.Number)))
+	msg, err := tx.AsMessage(signer, nil)
+	if err != nil {
+		b.Fatalf("failed to prepare transaction for tracing: %v", err)
+	}
+	origin, _ := signer.Sender(tx)
+	txContext := vm.TxContext{
+		Origin:   origin,
+		GasPrice: tx.GasPrice(),
+	}
+	context := vm.BlockContext{
+		CanTransfer: core.CanTransfer,
+		Transfer:    core.Transfer,
+		Coinbase:    test.Context.Miner,
+		BlockNumber: new(big.Int).SetUint64(uint64(test.Context.Number)),
+		Time:        new(big.Int).SetUint64(uint64(test.Context.Time)),
+		Difficulty:  (*big.Int)(test.Context.Difficulty),
+		GasLimit:    uint64(test.Context.GasLimit),
+	}
+	_, statedb := tests.MakePreState(rawdb.NewMemoryDatabase(), test.Genesis.Alloc, false)
+
+	// Create the tracer, the EVM environment and run it
+	tracer, err := New(tracerName, new(Context))
+	if err != nil {
+		b.Fatalf("failed to create call tracer: %v", err)
+	}
+	evm := vm.NewEVM(context, txContext, statedb, test.Genesis.Config, vm.Config{Debug: true, Tracer: tracer})
+
+	b.ReportAllocs()
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		snap := statedb.Snapshot()
+		st := core.NewStateTransition(evm, msg, new(core.GasPool).AddGas(tx.Gas()))
+		if _, err = st.TransitionDb(); err != nil {
+			b.Fatalf("failed to execute transaction: %v", err)
+		}
+		statedb.RevertToSnapshot(snap)
+	}
+}