cmd, core, eth/tracers: support fancier js tracing (ethereum#15516)

* cmd, core, eth/tracers: support fancier js tracing

* eth, internal/web3ext: rework trace API, concurrency, chain tracing

* eth/tracers: add three more JavaScript tracers

* eth/tracers, vendor: swap ottovm to duktape for tracing

* core, eth, internal: finalize call tracer and needed extras

* eth, tests: prestate tracer, call test suite, rewinding

* vendor: fix windows builds for tracer js engine

* vendor: temporary duktape fix

* eth/tracers: fix up 4byte and evmdis tracer

* vendor: pull in latest duktape with my upstream fixes

* eth: fix some review comments

* eth: rename rewind to reexec to make it more obvious

* core/vm: terminate tracing using defers

Author: karalabe

cmd/evm/json_logger.go

@@ -19,6 +19,7 @@ package main
 import (
 	"encoding/json"
 	"io"
+	"math/big"
 	"time"
 
 	"github.com/ethereum/go-ethereum/common"
@@ -35,6 +36,10 @@ func NewJSONLogger(cfg *vm.LogConfig, writer io.Writer) *JSONLogger {
 	return &JSONLogger{json.NewEncoder(writer), cfg}
 }
 
+func (l *JSONLogger) CaptureStart(from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int) error {
+	return nil
+}
+
 // CaptureState outputs state information on the logger.
 func (l *JSONLogger) CaptureState(env *vm.EVM, pc uint64, op vm.OpCode, gas, cost uint64, memory *vm.Memory, stack *vm.Stack, contract *vm.Contract, depth int, err error) error {
 	log := vm.StructLog{
@@ -56,6 +61,11 @@ func (l *JSONLogger) CaptureState(env *vm.EVM, pc uint64, op vm.OpCode, gas, cos
 	return l.encoder.Encode(log)
 }
 
+// CaptureFault outputs state information on the logger.
+func (l *JSONLogger) CaptureFault(env *vm.EVM, pc uint64, op vm.OpCode, gas, cost uint64, memory *vm.Memory, stack *vm.Stack, contract *vm.Contract, depth int, err error) error {
+	return nil
+}
+
 // CaptureEnd is triggered at end of execution.
 func (l *JSONLogger) CaptureEnd(output []byte, gasUsed uint64, t time.Duration, err error) error {
 	type endLog struct {

core/vm/evm.go

@@ -19,6 +19,7 @@ package vm
 import (
 	"math/big"
 	"sync/atomic"
+	"time"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto"
@@ -165,13 +166,23 @@ func (evm *EVM) Call(caller ContractRef, addr common.Address, input []byte, gas
 	}
 	evm.Transfer(evm.StateDB, caller.Address(), to.Address(), value)
 
-	// initialise a new contract and set the code that is to be used by the
-	// E The contract is a scoped environment for this execution context
-	// only.
+	// Initialise a new contract and set the code that is to be used by the EVM.
+	// The contract is a scoped environment for this execution context only.
 	contract := NewContract(caller, to, value, gas)
 	contract.SetCallCode(&addr, evm.StateDB.GetCodeHash(addr), evm.StateDB.GetCode(addr))
 
+	start := time.Now()
+
+	// Capture the tracer start/end events in debug mode
+	if evm.vmConfig.Debug && evm.depth == 0 {
+		evm.vmConfig.Tracer.CaptureStart(caller.Address(), addr, false, input, gas, value)
+
+		defer func() { // Lazy evaluation of the parameters
+			evm.vmConfig.Tracer.CaptureEnd(ret, gas-contract.Gas, time.Since(start), err)
+		}()
+	}
 	ret, err = run(evm, contract, input)
+
 	// When an error was returned by the EVM or when setting the creation code
 	// above we revert to the snapshot and consume any gas remaining. Additionally
 	// when we're in homestead this also counts for code storage gas errors.
@@ -338,7 +349,14 @@ func (evm *EVM) Create(caller ContractRef, code []byte, gas uint64, value *big.I
 	if evm.vmConfig.NoRecursion && evm.depth > 0 {
 		return nil, contractAddr, gas, nil
 	}
+
+	if evm.vmConfig.Debug && evm.depth == 0 {
+		evm.vmConfig.Tracer.CaptureStart(caller.Address(), contractAddr, true, code, gas, value)
+	}
+	start := time.Now()
+
 	ret, err = run(evm, contract, nil)
+
 	// check whether the max code size has been exceeded
 	maxCodeSizeExceeded := evm.ChainConfig().IsEIP158(evm.BlockNumber) && len(ret) > params.MaxCodeSize
 	// if the contract creation ran successfully and no errors were returned
@@ -367,6 +385,9 @@ func (evm *EVM) Create(caller ContractRef, code []byte, gas uint64, value *big.I
 	if maxCodeSizeExceeded && err == nil {
 		err = errMaxCodeSizeExceeded
 	}
+	if evm.vmConfig.Debug && evm.depth == 0 {
+		evm.vmConfig.Tracer.CaptureEnd(ret, gas-contract.Gas, time.Since(start), err)
+	}
 	return ret, contractAddr, contract.Gas, err
 }