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