// 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 . package tracing import ( "math/big" "github.com/ethereum/go-ethereum/common" "github.com/ethereum/go-ethereum/core/types" "github.com/ethereum/go-ethereum/params" "github.com/holiman/uint256" ) // OpContext provides the context at which the opcode is being // executed in, including the memory, stack and various contract-level information. type OpContext interface { MemoryData() []byte StackData() []uint256.Int Caller() common.Address Address() common.Address CallValue() *uint256.Int CallInput() []byte } // StateDB gives tracers access to the whole state. type StateDB interface { GetBalance(common.Address) *uint256.Int GetNonce(common.Address) uint64 GetCode(common.Address) []byte GetState(common.Address, common.Hash) common.Hash Exist(common.Address) bool GetRefund() uint64 } // VMContext provides the context for the EVM execution. type VMContext struct { Coinbase common.Address BlockNumber *big.Int Time uint64 Random *common.Hash // Effective tx gas price GasPrice *big.Int ChainConfig *params.ChainConfig StateDB StateDB } // BlockEvent is emitted upon tracing an incoming block. // It contains the block as well as consensus related information. type BlockEvent struct { Block *types.Block TD *big.Int Finalized *types.Header Safe *types.Header } type ( /* - VM events - */ // TxStartHook is called before the execution of a transaction starts. // Call simulations don't come with a valid signature. `from` field // to be used for address of the caller. TxStartHook = func(vm *VMContext, tx *types.Transaction, from common.Address) // TxEndHook is called after the execution of a transaction ends. TxEndHook = func(receipt *types.Receipt, err error) // EnterHook is invoked when the processing of a message starts. // // Take note that EnterHook, when in the context of a live tracer, can be invoked // outside of the `OnTxStart` and `OnTxEnd` hooks when dealing with system calls, // see [OnSystemCallStartHook] and [OnSystemCallEndHook] for more information. EnterHook = func(depth int, typ byte, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int) // ExitHook is invoked when the processing of a message ends. // `revert` is true when there was an error during the execution. // Exceptionally, before the homestead hardfork a contract creation that // ran out of gas when attempting to persist the code to database did not // count as a call failure and did not cause a revert of the call. This will // be indicated by `reverted == false` and `err == ErrCodeStoreOutOfGas`. // // Take note that ExitHook, when in the context of a live tracer, can be invoked // outside of the `OnTxStart` and `OnTxEnd` hooks when dealing with system calls, // see [OnSystemCallStartHook] and [OnSystemCallEndHook] for more information. ExitHook = func(depth int, output []byte, gasUsed uint64, err error, reverted bool) // OpcodeHook is invoked just prior to the execution of an opcode. OpcodeHook = func(pc uint64, op byte, gas, cost uint64, scope OpContext, rData []byte, depth int, err error) // FaultHook is invoked when an error occurs during the execution of an opcode. FaultHook = func(pc uint64, op byte, gas, cost uint64, scope OpContext, depth int, err error) // GasChangeHook is invoked when the gas changes. GasChangeHook = func(old, new uint64, reason GasChangeReason) /* - Chain events - */ // BlockchainInitHook is called when the blockchain is initialized. BlockchainInitHook = func(chainConfig *params.ChainConfig) // CloseHook is called when the blockchain closes. CloseHook = func() // BlockStartHook is called before executing `block`. // `td` is the total difficulty prior to `block`. BlockStartHook = func(event BlockEvent) // BlockEndHook is called after executing a block. BlockEndHook = func(err error) // SkippedBlockHook indicates a block was skipped during processing // due to it being known previously. This can happen e.g. when recovering // from a crash. SkippedBlockHook = func(event BlockEvent) // GenesisBlockHook is called when the genesis block is being processed. GenesisBlockHook = func(genesis *types.Block, alloc types.GenesisAlloc) // OnSystemCallStartHook is called when a system call is about to be executed. Today, // this hook is invoked when the EIP-4788 system call is about to be executed to set the // beacon block root. // // After this hook, the EVM call tracing will happened as usual so you will receive a `OnEnter/OnExit` // as well as state hooks between this hook and the `OnSystemCallEndHook`. // // Note that system call happens outside normal transaction execution, so the `OnTxStart/OnTxEnd` hooks // will not be invoked. OnSystemCallStartHook = func() // OnSystemCallEndHook is called when a system call has finished executing. Today, // this hook is invoked when the EIP-4788 system call is about to be executed to set the // beacon block root. OnSystemCallEndHook = func() /* - State events - */ // BalanceChangeHook is called when the balance of an account changes. BalanceChangeHook = func(addr common.Address, prev, new *big.Int, reason BalanceChangeReason) // NonceChangeHook is called when the nonce of an account changes. NonceChangeHook = func(addr common.Address, prev, new uint64) // CodeChangeHook is called when the code of an account changes. CodeChangeHook = func(addr common.Address, prevCodeHash common.Hash, prevCode []byte, codeHash common.Hash, code []byte) // StorageChangeHook is called when the storage of an account changes. StorageChangeHook = func(addr common.Address, slot common.Hash, prev, new common.Hash) // LogHook is called when a log is emitted. LogHook = func(log *types.Log) ) type Hooks struct { // VM events OnTxStart TxStartHook OnTxEnd TxEndHook OnEnter EnterHook OnExit ExitHook OnOpcode OpcodeHook OnFault FaultHook OnGasChange GasChangeHook // Chain events OnBlockchainInit BlockchainInitHook OnClose CloseHook OnBlockStart BlockStartHook OnBlockEnd BlockEndHook OnSkippedBlock SkippedBlockHook OnGenesisBlock GenesisBlockHook OnSystemCallStart OnSystemCallStartHook OnSystemCallEnd OnSystemCallEndHook // State events OnBalanceChange BalanceChangeHook OnNonceChange NonceChangeHook OnCodeChange CodeChangeHook OnStorageChange StorageChangeHook OnLog LogHook } // BalanceChangeReason is used to indicate the reason for a balance change, useful // for tracing and reporting. type BalanceChangeReason byte //go:generate go run golang.org/x/tools/cmd/stringer -type=BalanceChangeReason -output gen_balance_change_reason_stringer.go const ( BalanceChangeUnspecified BalanceChangeReason = 0 // Issuance // BalanceIncreaseRewardMineUncle is a reward for mining an uncle block. BalanceIncreaseRewardMineUncle BalanceChangeReason = 1 // BalanceIncreaseRewardMineBlock is a reward for mining a block. BalanceIncreaseRewardMineBlock BalanceChangeReason = 2 // BalanceIncreaseWithdrawal is ether withdrawn from the beacon chain. BalanceIncreaseWithdrawal BalanceChangeReason = 3 // BalanceIncreaseGenesisBalance is ether allocated at the genesis block. BalanceIncreaseGenesisBalance BalanceChangeReason = 4 // Transaction fees // BalanceIncreaseRewardTransactionFee is the transaction tip increasing block builder's balance. BalanceIncreaseRewardTransactionFee BalanceChangeReason = 5 // BalanceDecreaseGasBuy is spent to purchase gas for execution a transaction. // Part of this gas will be burnt as per EIP-1559 rules. BalanceDecreaseGasBuy BalanceChangeReason = 6 // BalanceIncreaseGasReturn is ether returned for unused gas at the end of execution. BalanceIncreaseGasReturn BalanceChangeReason = 7 // DAO fork // BalanceIncreaseDaoContract is ether sent to the DAO refund contract. BalanceIncreaseDaoContract BalanceChangeReason = 8 // BalanceDecreaseDaoAccount is ether taken from a DAO account to be moved to the refund contract. BalanceDecreaseDaoAccount BalanceChangeReason = 9 // BalanceChangeTransfer is ether transferred via a call. // it is a decrease for the sender and an increase for the recipient. BalanceChangeTransfer BalanceChangeReason = 10 // BalanceChangeTouchAccount is a transfer of zero value. It is only there to // touch-create an account. BalanceChangeTouchAccount BalanceChangeReason = 11 // BalanceIncreaseSelfdestruct is added to the recipient as indicated by a selfdestructing account. BalanceIncreaseSelfdestruct BalanceChangeReason = 12 // BalanceDecreaseSelfdestruct is deducted from a contract due to self-destruct. BalanceDecreaseSelfdestruct BalanceChangeReason = 13 // BalanceDecreaseSelfdestructBurn is ether that is sent to an already self-destructed // account within the same tx (captured at end of tx). // Note it doesn't account for a self-destruct which appoints itself as recipient. BalanceDecreaseSelfdestructBurn BalanceChangeReason = 14 ) // GasChangeReason is used to indicate the reason for a gas change, useful // for tracing and reporting. // // There is essentially two types of gas changes, those that can be emitted once per transaction // and those that can be emitted on a call basis, so possibly multiple times per transaction. // // They can be recognized easily by their name, those that start with `GasChangeTx` are emitted // once per transaction, while those that start with `GasChangeCall` are emitted on a call basis. type GasChangeReason byte const ( GasChangeUnspecified GasChangeReason = 0 // GasChangeTxInitialBalance is the initial balance for the call which will be equal to the gasLimit of the call. There is only // one such gas change per transaction. GasChangeTxInitialBalance GasChangeReason = 1 // GasChangeTxIntrinsicGas is the amount of gas that will be charged for the intrinsic cost of the transaction, there is // always exactly one of those per transaction. GasChangeTxIntrinsicGas GasChangeReason = 2 // GasChangeTxRefunds is the sum of all refunds which happened during the tx execution (e.g. storage slot being cleared) // this generates an increase in gas. There is at most one of such gas change per transaction. GasChangeTxRefunds GasChangeReason = 3 // GasChangeTxLeftOverReturned is the amount of gas left over at the end of transaction's execution that will be returned // to the chain. This change will always be a negative change as we "drain" left over gas towards 0. If there was no gas // left at the end of execution, no such even will be emitted. The returned gas's value in Wei is returned to caller. // There is at most one of such gas change per transaction. GasChangeTxLeftOverReturned GasChangeReason = 4 // GasChangeCallInitialBalance is the initial balance for the call which will be equal to the gasLimit of the call. There is only // one such gas change per call. GasChangeCallInitialBalance GasChangeReason = 5 // GasChangeCallLeftOverReturned is the amount of gas left over that will be returned to the caller, this change will always // be a negative change as we "drain" left over gas towards 0. If there was no gas left at the end of execution, no such even // will be emitted. GasChangeCallLeftOverReturned GasChangeReason = 6 // GasChangeCallLeftOverRefunded is the amount of gas that will be refunded to the call after the child call execution it // executed completed. This value is always positive as we are giving gas back to the you, the left over gas of the child. // If there was no gas left to be refunded, no such even will be emitted. GasChangeCallLeftOverRefunded GasChangeReason = 7 // GasChangeCallContractCreation is the amount of gas that will be burned for a CREATE. GasChangeCallContractCreation GasChangeReason = 8 // GasChangeContractCreation is the amount of gas that will be burned for a CREATE2. GasChangeCallContractCreation2 GasChangeReason = 9 // GasChangeCallCodeStorage is the amount of gas that will be charged for code storage. GasChangeCallCodeStorage GasChangeReason = 10 // GasChangeCallOpCode is the amount of gas that will be charged for an opcode executed by the EVM, exact opcode that was // performed can be check by `OnOpcode` handling. GasChangeCallOpCode GasChangeReason = 11 // GasChangeCallPrecompiledContract is the amount of gas that will be charged for a precompiled contract execution. GasChangeCallPrecompiledContract GasChangeReason = 12 // GasChangeCallStorageColdAccess is the amount of gas that will be charged for a cold storage access as controlled by EIP2929 rules. GasChangeCallStorageColdAccess GasChangeReason = 13 // GasChangeCallFailedExecution is the burning of the remaining gas when the execution failed without a revert. GasChangeCallFailedExecution GasChangeReason = 14 // GasChangeWitnessContractInit is the amount charged for adding to the witness during the contract creation initialization step GasChangeWitnessContractInit GasChangeReason = 15 // GasChangeWitnessContractCreation is the amount charged for adding to the witness during the contract creation finalization step GasChangeWitnessContractCreation GasChangeReason = 16 // GasChangeWitnessCodeChunk is the amount charged for touching one or more contract code chunks GasChangeWitnessCodeChunk GasChangeReason = 17 // GasChangeIgnored is a special value that can be used to indicate that the gas change should be ignored as // it will be "manually" tracked by a direct emit of the gas change event. GasChangeIgnored GasChangeReason = 0xFF )