evm

package
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Published: Oct 25, 2023 License: GPL-3.0 Imports: 25 Imported by: 21

Documentation

Overview

package evm implements the Hpb Virtual Machine.

The vm package implements two EVMs, a byte code VM and a JIT VM. The BC (Byte Code) VM loops over a set of bytes and executes them according to the set of rules defined in the Hpb yellow paper. When the BC VM is invoked it invokes the JIT VM in a separate goroutine and compiles the byte code in JIT instructions.

The JIT VM, when invoked, loops around a set of pre-defined instructions until it either runs of gas, causes an internal error, returns or stops.

The JIT optimiser attempts to pre-compile instructions in to chunks or segments such as multiple PUSH operations and static JUMPs. It does this by analysing the opcodes and attempts to match certain regions to known sets. Whenever the optimiser finds said segments it creates a new instruction and replaces the first occurrence in the sequence.

Index

Constants

View Source
const (
	GasQuickStep   uint64 = 2
	GasFastestStep uint64 = 3
	GasFastStep    uint64 = 5
	GasMidStep     uint64 = 8
	GasSlowStep    uint64 = 10
	GasExtStep     uint64 = 20

	GasReturn       uint64 = 0
	GasStop         uint64 = 0
	GasContractByte uint64 = 200
)
View Source
const (
	GROUP_ORDER = 0x30644e72e131a029b85045b68181585d2833e84879b9709143e1f593f0000001
	FIELD_ORDER = 0x30644e72e131a029b85045b68181585d97816a916871ca8d3c208c16d87cfd47
)

Variables

View Source
var (
	// ErrInvalidSubroutineEntry means that a BEGINSUB was reached via iteration,
	// as opposed to from a JUMPSUB instruction
	ErrInvalidSubroutineEntry   = errors.New("invalid subroutine entry")
	ErrOutOfGas                 = errors.New("out of gas")
	ErrCodeStoreOutOfGas        = errors.New("contract creation code storage out of gas")
	ErrDepth                    = errors.New("max call depth exceeded")
	ErrTraceLimitReached        = errors.New("the number of logs reached the specified limit")
	ErrInsufficientBalance      = errors.New("insufficient balance for transfer")
	ErrContractAddressCollision = errors.New("contract address collision")
	ErrExecutionReverted        = errors.New("execution reverted")
	ErrMaxCodeSizeExceeded      = errors.New("max code size exceeded")
	ErrInvalidJump              = errors.New("invalid jump destination")
	ErrWriteProtection          = errors.New("write protection")
	ErrReturnDataOutOfBounds    = errors.New("return data out of bounds")
	// ErrGasUintOverflow          = errors.New("gas uint64 overflow")
	ErrInvalidRetsub       = errors.New("invalid retsub")
	ErrReturnStackExceeded = errors.New("return stack limit reached")

	// ErrIntrinsicGas is returned if the transaction is specified to use less gas
	// than required to start the invocation.
	ErrIntrinsicGas = errors.New("intrinsic gas too low")
)
View Source
var PrecompiledContractsByzantium = map[common.Address]PrecompiledContract{
	common.BytesToAddress([]byte{1}): &ecrecover{},
	common.BytesToAddress([]byte{2}): &sha256hash{},
	common.BytesToAddress([]byte{3}): &ripemd160hash{},
	common.BytesToAddress([]byte{4}): &dataCopy{},
	common.BytesToAddress([]byte{5}): &bigModExp{eip2565: false},
	common.BytesToAddress([]byte{6}): &bn256AddByzantium{},
	common.BytesToAddress([]byte{7}): &bn256ScalarMulByzantium{},
	common.BytesToAddress([]byte{8}): &bn256PairingByzantium{},
}

PrecompiledContractsByzantium contains the default set of pre-compiled Hpb contracts used in the Byzantium release.

View Source
var PrecompiledContractsIstanbul = map[common.Address]PrecompiledContract{
	common.BytesToAddress([]byte{1}):   &ecrecover{},
	common.BytesToAddress([]byte{2}):   &sha256hash{},
	common.BytesToAddress([]byte{3}):   &ripemd160hash{},
	common.BytesToAddress([]byte{4}):   &dataCopy{},
	common.BytesToAddress([]byte{5}):   &bigModExp{eip2565: false},
	common.BytesToAddress([]byte{6}):   &bn256AddIstanbul{},
	common.BytesToAddress([]byte{7}):   &bn256ScalarMulIstanbul{},
	common.BytesToAddress([]byte{8}):   &bn256PairingIstanbul{},
	common.BytesToAddress([]byte{9}):   &blake2F{},
	common.BytesToAddress([]byte{100}): &zscverify{},
}

PrecompiledContractsIstanbul contains the default set of pre-compiled Ethereum contracts used in the Istanbul release.

Functions

func CanTransfer

func CanTransfer(db vmcore.StateDB, addr common.Address, amount *big.Int) bool

CanTransfer checks wether there are enough funds in the address' account to make a transfer. This does not take the necessary gas in to account to make the transfer valid.

func GetHashFn

func GetHashFn(ref *types.Header, chain ChainContext) func(n uint64) common.Hash

GetHashFn returns a GetHashFunc which retrieves header hashes by number

func NewByzantiumInstructionSet

func NewByzantiumInstructionSet() [256]operation

NewByzantiumInstructionSet returns the frontier, homestead and byzantium instructions.

func NewConstantinopleInstructionSet

func NewConstantinopleInstructionSet() [256]operation

NewConstantinopleInstructionSet returns the frontier, homestead byzantium and contantinople instructions.

func NewFrontierInstructionSet

func NewFrontierInstructionSet() [256]operation

NewFrontierInstructionSet returns the frontier instructions that can be executed during the frontier phase.

func NewHomesteadInstructionSet

func NewHomesteadInstructionSet() [256]operation

NewHomesteadInstructionSet returns the frontier and homestead instructions that can be executed during the homestead phase.

func NewMarkdownLogger

func NewMarkdownLogger(cfg *LogConfig, writer io.Writer) *mdLogger

NewMarkdownLogger creates a logger which outputs information in a format adapted for human readability, and is also a valid markdown table

func NoopCanTransfer

func NoopCanTransfer(db vmcore.StateDB, from common.Address, balance *big.Int) bool

func NoopTransfer

func NoopTransfer(db vmcore.StateDB, from, to common.Address, amount *big.Int)

func RunPrecompiledContract

func RunPrecompiledContract(p PrecompiledContract, input []byte, contract *Contract) (ret []byte, err error)

RunPrecompiledContract runs and evaluates the output of a precompiled contract.

func Transfer

func Transfer(db vmcore.StateDB, sender, recipient common.Address, amount *big.Int)

Transfer subtracts amount from sender and adds amount to recipient using the given Db

func WriteLogs

func WriteLogs(writer io.Writer, logs []*types.Log)

WriteLogs writes vm logs in a readable format to the given writer

func WriteTrace

func WriteTrace(writer io.Writer, logs []StructLog)

WriteTrace writes a formatted trace to the given writer

Types

type CallContext

type CallContext interface {
	// Call another contract
	Call(env *EVM, me vmcore.ContractRef, addr common.Address, data []byte, gas, value *big.Int) ([]byte, error)
	// Take another's contract code and execute within our own context
	CallCode(env *EVM, me vmcore.ContractRef, addr common.Address, data []byte, gas, value *big.Int) ([]byte, error)
	// Same as CallCode except sender and value is propagated from parent to child scope
	DelegateCall(env *EVM, me vmcore.ContractRef, addr common.Address, data []byte, gas *big.Int) ([]byte, error)
	// Create a new contract
	Create(env *EVM, me vmcore.ContractRef, data []byte, gas, value *big.Int) ([]byte, common.Address, error)
}

CallContext provides a basic interface for the EVM calling conventions. The EVM EVM depends on this context being implemented for doing subcalls and initialising new EVM contracts.

type CanTransferFunc

type CanTransferFunc func(vmcore.StateDB, common.Address, *big.Int) bool

type ChainContext

type ChainContext interface {
	// Engine retrieves the chain's consensus engine.
	Engine() consensus.Engine

	// GetHeader returns the hash corresponding to their hash.
	GetHeader(common.Hash, uint64) *types.Header
}

ChainContext supports retrieving headers and consensus parameters from the current blockchain to be used during transaction processing.

type Config

type Config struct {
	// Debug enabled debugging Interpreter options
	Debug bool
	// EnableJit enabled the JIT VM
	EnableJit bool
	// ForceJit forces the JIT VM
	ForceJit bool
	// Tracer is the op code logger
	Tracer Tracer
	// NoRecursion disabled Interpreter call, callcode,
	// delegate call and create.
	NoRecursion bool
	// Disable gas metering
	DisableGasMetering bool
	// Enable recording of SHA3/keccak preimages
	EnablePreimageRecording bool
	// JumpTable contains the EVM instruction table. This
	// may be left uninitialised and will be set to the default
	// table.
	JumpTable [256]operation
}

Config are the configuration options for the Interpreter

type Context

type Context struct {
	// CanTransfer returns whether the account contains
	// sufficient hpber to transfer the value
	CanTransfer CanTransferFunc
	// Transfer transfers hpber from one account to the other
	Transfer TransferFunc
	// GetHash returns the hash corresponding to n
	GetHash GetHashFunc

	// Message information
	Origin   common.Address // Provides information for ORIGIN
	GasPrice *big.Int       // Provides information for GASPRICE

	// Block information
	Miner       common.Address // Provides information for COINBASE
	GasLimit    *big.Int       // Provides information for GASLIMIT
	BlockNumber *big.Int       // Provides information for NUMBER
	Time        *big.Int       // Provides information for TIME
	Difficulty  *big.Int       // Provides information for DIFFICULTY
	Random      []byte
}

Context provides the EVM with auxiliary information. Once provided it shouldn't be modified.

type Contract

type Contract struct {
	// CallerAddress is the result of the caller which initialised this
	// contract. However when the "call method" is delegated this value
	// needs to be initialised to that of the caller's caller.
	CallerAddress common.Address

	Code     []byte
	CodeHash common.Hash
	CodeAddr *common.Address
	Input    []byte

	Gas uint64

	Args []byte

	DelegateCall bool
	// contains filtered or unexported fields
}

Contract represents an hpb contract in the state database. It contains the the contract code, calling arguments. Contract implements ContractRef

func NewContract

func NewContract(caller vmcore.ContractRef, object vmcore.ContractRef, value *big.Int, gas uint64) *Contract

NewContract returns a new contract environment for the execution of EVM.

func (*Contract) Address

func (c *Contract) Address() common.Address

Address returns the contracts address

func (*Contract) AsDelegate

func (c *Contract) AsDelegate() *Contract

AsDelegate sets the contract to be a delegate call and returns the current contract (for chaining calls)

func (*Contract) Caller

func (c *Contract) Caller() common.Address

Caller returns the caller of the contract.

Caller will recursively call caller when the contract is a delegate call, including that of caller's caller.

func (*Contract) GetByte

func (c *Contract) GetByte(n uint64) byte

GetByte returns the n'th byte in the contract's byte array

func (*Contract) GetOp

func (c *Contract) GetOp(n uint64) OpCode

GetOp returns the n'th element in the contract's byte array

func (*Contract) SetCallCode

func (c *Contract) SetCallCode(addr *common.Address, hash common.Hash, code []byte)

SetCallCode sets the code of the contract and address of the backing data object

func (*Contract) SetCode

func (c *Contract) SetCode(hash common.Hash, code []byte)

SetCode sets the code to the contract

func (*Contract) UseGas

func (c *Contract) UseGas(gas uint64) (ok bool)

UseGas attempts the use gas and subtracts it and returns true on success

func (*Contract) Value

func (c *Contract) Value() *big.Int

Value returns the contracts value (sent to it from it's caller)

type EVM

type EVM struct {
	// Context provides auxiliary blockchain related information
	Context
	// StateDB gives access to the underlying state
	StateDB vmcore.StateDB

	StateDiff []*vmcore.State_Diff
	// contains filtered or unexported fields
}

func NewEVM

func NewEVM(ctx Context, statedb vmcore.StateDB, chainConfig *config.ChainConfig, vmConfig Config) *EVM

NewEVM retutrns a new EVM . The returned EVM is not thread safe and should only ever be used *once*.

func (*EVM) ActivePrecompiles

func (evm *EVM) ActivePrecompiles() map[common.Address]PrecompiledContract

func (*EVM) Call

func (evm *EVM) Call(caller vmcore.ContractRef, addr common.Address, input []byte, gas uint64, value *big.Int) (ret []byte, leftOverGas uint64, err error)

Call executes the contract associated with the addr with the given input as parameters. It also handles any necessary value transfer required and takes the necessary steps to create accounts and reverses the state in case of an execution error or failed value transfer.

func (*EVM) CallCode

func (evm *EVM) CallCode(caller vmcore.ContractRef, addr common.Address, input []byte, gas uint64, value *big.Int) (ret []byte, leftOverGas uint64, err error)

CallCode executes the contract associated with the addr with the given input as parameters. It also handles any necessary value transfer required and takes the necessary steps to create accounts and reverses the state in case of an execution error or failed value transfer.

CallCode differs from Call in the sense that it executes the given address' code with the caller as context.

func (*EVM) Cancel

func (evm *EVM) Cancel()

Cancel cancels any running EVM operation. This may be called concurrently and it's safe to be called multiple times.

func (*EVM) Cancelled

func (evm *EVM) Cancelled() bool

Cancelled returns true if Cancel has been called

func (*EVM) ChainConfig

func (evm *EVM) ChainConfig() *config.ChainConfig

ChainConfig returns the evmironment's chain configuration

func (*EVM) Create

func (evm *EVM) Create(caller vmcore.ContractRef, code []byte, gas uint64, value *big.Int) (ret []byte, contractAddr common.Address, leftOverGas uint64, err error)

Create creates a new contract using code as deployment code.

func (*EVM) Create2

func (evm *EVM) Create2(caller vmcore.ContractRef, code []byte, gas uint64, value *big.Int, salt *big.Int) (ret []byte, contractAddr common.Address, leftOverGas uint64, err error)

func (*EVM) DelegateCall

func (evm *EVM) DelegateCall(caller vmcore.ContractRef, addr common.Address, input []byte, gas uint64) (ret []byte, leftOverGas uint64, err error)

DelegateCall executes the contract associated with the addr with the given input as parameters. It reverses the state in case of an execution error.

DelegateCall differs from CallCode in the sense that it executes the given address' code with the caller as context and the caller is set to the caller of the caller.

func (*EVM) GetCoinbase

func (evm *EVM) GetCoinbase() common.Address

func (*EVM) GetOrigin

func (evm *EVM) GetOrigin() common.Address

func (*EVM) GetStateDB

func (evm *EVM) GetStateDB() vmcore.StateDB

func (*EVM) GetStateDiff

func (evm *EVM) GetStateDiff() []*vmcore.State_Diff

func (*EVM) InnerCall

func (evm *EVM) InnerCall(caller vmcore.ContractRef, addr common.Address, input []byte) (ret []byte, err error)

func (*EVM) Interpreter

func (evm *EVM) Interpreter() *Interpreter

Interpreter returns the EVM interpreter

func (*EVM) StaticCall

func (evm *EVM) StaticCall(caller vmcore.ContractRef, addr common.Address, input []byte, gas uint64) (ret []byte, leftOverGas uint64, err error)

StaticCall executes the contract associated with the addr with the given input as parameters while disallowing any modifications to the state during the call. Opcodes that attempt to perform such modifications will result in exceptions instead of performing the modifications.

type G1Point

type G1Point struct {
	// contains filtered or unexported fields
}

type GetHashFunc

type GetHashFunc func(uint64) common.Hash

GetHashFunc returns the nth block hash in the blockchain and is used by the BLOCKHASH EVM op code.

type Interpreter

type Interpreter struct {
	// contains filtered or unexported fields
}

Interpreter is used to run Hpb based contracts and will utilise the passed evmironment to query external sources for state information. The Interpreter will run the byte code VM or JIT VM based on the passed configuration.

func NewInterpreter

func NewInterpreter(evm *EVM, cfg Config) *Interpreter

NewInterpreter returns a new instance of the Interpreter.

func (*Interpreter) Run

func (in *Interpreter) Run(snapshot int, contract *Contract, input []byte) (ret []byte, err error)

Run loops and evaluates the contract's code with the given input data and returns the return byte-slice and an error if one occurred.

It's important to note that any errors returned by the interpreter should be considered a revert-and-consume-all-gas operation. No error specific checks should be handled to reduce complexity and errors further down the in.

type JSONLogger

type JSONLogger struct {
	// contains filtered or unexported fields
}

func NewJSONLogger

func NewJSONLogger(cfg *LogConfig, writer io.Writer) *JSONLogger

NewJSONLogger creates a new EVM tracer that prints execution steps as JSON objects into the provided stream.

func (*JSONLogger) CaptureEnd

func (l *JSONLogger) CaptureEnd(output []byte, gasUsed uint64, t time.Duration, err error) error

CaptureEnd is triggered at end of execution.

func (*JSONLogger) CaptureFault

func (l *JSONLogger) CaptureFault(env *EVM, pc uint64, op OpCode, gas, cost uint64, memory *Memory, stack *Stack, rStack *ReturnStack, contract *Contract, depth int, err error) error

CaptureFault outputs state information on the logger.

func (*JSONLogger) CaptureStart

func (l *JSONLogger) CaptureStart(from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int) error

func (*JSONLogger) CaptureState

func (l *JSONLogger) CaptureState(env *EVM, pc uint64, op OpCode, gas, cost uint64, memory *Memory, stack *Stack, rStack *ReturnStack, rData []byte, contract *Contract, depth int, err error) error

CaptureState outputs state information on the logger.

type LogConfig

type LogConfig struct {
	DisableMemory     bool // disable memory capture
	DisableStack      bool // disable stack capture
	DisableStorage    bool // disable storage capture
	DisableReturnData bool // disable return data capture
	Debug             bool // print output during capture end
	Limit             int  // maximum length of output, but zero means unlimited
	// Chain overrides, can be used to execute a trace using future fork rules
	Overrides *params.ChainConfig `json:"overrides,omitempty"`
}

LogConfig are the configuration options for structured logger the EVM

type Memory

type Memory struct {
	// contains filtered or unexported fields
}

Memory implements a simple memory model for the ghpb virtual machine.

func NewMemory

func NewMemory() *Memory

func (*Memory) Data

func (m *Memory) Data() []byte

Data returns the backing slice

func (*Memory) Get

func (self *Memory) Get(offset, size int64) (cpy []byte)

Get returns offset + size as a new slice

func (*Memory) GetPtr

func (self *Memory) GetPtr(offset, size int64) []byte

GetPtr returns the offset + size

func (*Memory) Len

func (m *Memory) Len() int

Len returns the length of the backing slice

func (*Memory) Print

func (m *Memory) Print()

func (*Memory) Resize

func (m *Memory) Resize(size uint64)

Resize resizes the memory to size

func (*Memory) Set

func (m *Memory) Set(offset, size uint64, value []byte)

Set sets offset + size to value

type NoopEVMCallContext

type NoopEVMCallContext struct{}

func (NoopEVMCallContext) Call

func (NoopEVMCallContext) Call(caller vmcore.ContractRef, addr common.Address, data []byte, gas, value *big.Int) ([]byte, error)

func (NoopEVMCallContext) CallCode

func (NoopEVMCallContext) CallCode(caller vmcore.ContractRef, addr common.Address, data []byte, gas, value *big.Int) ([]byte, error)

func (NoopEVMCallContext) Create

func (NoopEVMCallContext) Create(caller vmcore.ContractRef, data []byte, gas, value *big.Int) ([]byte, common.Address, error)

func (NoopEVMCallContext) DelegateCall

func (NoopEVMCallContext) DelegateCall(me vmcore.ContractRef, addr common.Address, data []byte, gas *big.Int) ([]byte, error)

type NoopStateDB

type NoopStateDB struct{}

func (NoopStateDB) AddBalance

func (NoopStateDB) AddBalance(common.Address, *big.Int)

func (NoopStateDB) AddLog

func (NoopStateDB) AddLog(*types.Log)

func (NoopStateDB) AddPreimage

func (NoopStateDB) AddPreimage(common.Hash, []byte)

func (NoopStateDB) AddRefund

func (NoopStateDB) AddRefund(uint64)

func (NoopStateDB) CreateAccount

func (NoopStateDB) CreateAccount(common.Address)

func (NoopStateDB) Empty

func (NoopStateDB) Empty(common.Address) bool

func (NoopStateDB) Exist

func (NoopStateDB) Exist(common.Address) bool

func (NoopStateDB) ForEachStorage

func (NoopStateDB) ForEachStorage(common.Address, func(common.Hash, common.Hash) bool) error

func (NoopStateDB) GetBalance

func (NoopStateDB) GetBalance(common.Address) *big.Int

func (NoopStateDB) GetCode

func (NoopStateDB) GetCode(common.Address) []byte

func (NoopStateDB) GetCodeHash

func (NoopStateDB) GetCodeHash(common.Address) common.Hash

func (NoopStateDB) GetCodeSize

func (NoopStateDB) GetCodeSize(common.Address) int

func (NoopStateDB) GetNonce

func (NoopStateDB) GetNonce(common.Address) uint64

func (NoopStateDB) GetRefund

func (NoopStateDB) GetRefund() uint64

func (NoopStateDB) GetState

func (NoopStateDB) HasSuicided

func (NoopStateDB) HasSuicided(common.Address) bool

func (NoopStateDB) RevertToSnapshot

func (NoopStateDB) RevertToSnapshot(int)

func (NoopStateDB) SetCode

func (NoopStateDB) SetCode(common.Address, []byte)

func (NoopStateDB) SetNonce

func (NoopStateDB) SetNonce(common.Address, uint64)

func (NoopStateDB) SetState

func (NoopStateDB) Snapshot

func (NoopStateDB) Snapshot() int

func (NoopStateDB) SubBalance

func (NoopStateDB) SubBalance(common.Address, *big.Int)

func (NoopStateDB) Suicide

func (NoopStateDB) Suicide(common.Address) bool

type OpCode

type OpCode byte

OpCode is an EVM opcode

const (
	STOP OpCode = iota
	ADD
	MUL
	SUB
	DIV
	SDIV
	MOD
	SMOD
	ADDMOD
	MULMOD
	EXP
	SIGNEXTEND
)

0x0 range - arithmetic ops.

const (
	LT OpCode = iota + 0x10
	GT
	SLT
	SGT
	EQ
	ISZERO
	AND
	OR
	XOR
	NOT
	BYTE
	SHL
	SHR
	SAR

	SHA3 = 0x20
)

0x10 range - comparison ops.

const (
	ADDRESS OpCode = 0x30 + iota
	BALANCE
	ORIGIN
	CALLER
	CALLVALUE
	CALLDATALOAD
	CALLDATASIZE
	CALLDATACOPY
	CODESIZE
	CODECOPY
	GASPRICE
	EXTCODESIZE
	EXTCODECOPY
	RETURNDATASIZE
	RETURNDATACOPY
	EXTCODEHASH
)

0x30 range - closure state.

const (
	BLOCKHASH OpCode = 0x40 + iota
	COINBASE
	TIMESTAMP
	NUMBER
	DIFFICULTY
	GASLIMIT
	DRANDOM
	CHAINID     OpCode = 0x46
	SELFBALANCE OpCode = 0x47
)

0x40 range - block operations.

const (
	POP       OpCode = 0x50
	MLOAD     OpCode = 0x51
	MSTORE    OpCode = 0x52
	MSTORE8   OpCode = 0x53
	SLOAD     OpCode = 0x54
	SSTORE    OpCode = 0x55
	JUMP      OpCode = 0x56
	JUMPI     OpCode = 0x57
	PC        OpCode = 0x58
	MSIZE     OpCode = 0x59
	GAS       OpCode = 0x5a
	JUMPDEST  OpCode = 0x5b
	BEGINSUB  OpCode = 0x5c
	RETURNSUB OpCode = 0x5d
	JUMPSUB   OpCode = 0x5e
)

0x50 range - 'storage' and execution.

const (
	PUSH1 OpCode = 0x60 + iota
	PUSH2
	PUSH3
	PUSH4
	PUSH5
	PUSH6
	PUSH7
	PUSH8
	PUSH9
	PUSH10
	PUSH11
	PUSH12
	PUSH13
	PUSH14
	PUSH15
	PUSH16
	PUSH17
	PUSH18
	PUSH19
	PUSH20
	PUSH21
	PUSH22
	PUSH23
	PUSH24
	PUSH25
	PUSH26
	PUSH27
	PUSH28
	PUSH29
	PUSH30
	PUSH31
	PUSH32
	DUP1
	DUP2
	DUP3
	DUP4
	DUP5
	DUP6
	DUP7
	DUP8
	DUP9
	DUP10
	DUP11
	DUP12
	DUP13
	DUP14
	DUP15
	DUP16
	SWAP1
	SWAP2
	SWAP3
	SWAP4
	SWAP5
	SWAP6
	SWAP7
	SWAP8
	SWAP9
	SWAP10
	SWAP11
	SWAP12
	SWAP13
	SWAP14
	SWAP15
	SWAP16
)

0x60 range.

const (
	LOG0 OpCode = 0xa0 + iota
	LOG1
	LOG2
	LOG3
	LOG4
)

0xa0 range - logging ops.

const (
	PUSH OpCode = 0xb0 + iota
	DUP
	SWAP
)

unofficial opcodes used for parsing.

const (
	CREATE OpCode = 0xf0 + iota
	CALL
	CALLCODE
	RETURN
	DELEGATECALL
	CREATE2
	STATICCALL = 0xfa

	REVERT       = 0xfd
	SELFDESTRUCT = 0xff
)

0xf0 range - closures

const (
	RANDOM OpCode = 0xEF
)

0xE0 range HPB opcode

func StringToOp

func StringToOp(str string) OpCode

StringToOp finds the opcode whose name is stored in `str`.

func (OpCode) IsPush

func (op OpCode) IsPush() bool

IsPush specifies if an opcode is a PUSH opcode.

func (OpCode) IsStaticJump

func (op OpCode) IsStaticJump() bool

IsStaticJump specifies if an opcode is JUMP.

func (OpCode) String

func (op OpCode) String() string

type PrecompiledContract

type PrecompiledContract interface {
	RequiredGas(input []byte) uint64  // RequiredPrice calculates the contract gas use
	Run(input []byte) ([]byte, error) // Run runs the precompiled contract
}

PrecompiledContract is the basic interface for native Go contracts. The implementation requires a deterministic gas count based on the input size of the Run method of the contract.

type ReturnStack

type ReturnStack struct {
	// contains filtered or unexported fields
}

ReturnStack is an object for basic return stack operations.

type Stack

type Stack struct {
	// contains filtered or unexported fields
}

Stack is an object for basic stack operations. Items popped to the stack are expected to be changed and modified. stack does not take care of adding newly initialised objects.

func (*Stack) Back

func (st *Stack) Back(n int) *big.Int

Back returns the n'th item in stack

func (*Stack) Data

func (st *Stack) Data() []*big.Int

func (*Stack) Print

func (st *Stack) Print()

type Storage

type Storage map[common.Hash]common.Hash

Storage represents a contract's storage.

func (Storage) Copy

func (s Storage) Copy() Storage

Copy duplicates the current storage.

type StructLog

type StructLog struct {
	Pc            uint64                      `json:"pc"`
	Op            OpCode                      `json:"op"`
	Gas           uint64                      `json:"gas"`
	GasCost       uint64                      `json:"gasCost"`
	Memory        []byte                      `json:"memory"`
	MemorySize    int                         `json:"memSize"`
	Stack         []*big.Int                  `json:"stack"`
	ReturnStack   []uint32                    `json:"returnStack"`
	ReturnData    []byte                      `json:"returnData"`
	Storage       map[common.Hash]common.Hash `json:"-"`
	Depth         int                         `json:"depth"`
	RefundCounter uint64                      `json:"refund"`
	Err           error                       `json:"-"`
}

StructLog is emitted to the EVM each cycle and lists information about the current internal state prior to the execution of the statement.

func (*StructLog) ErrorString

func (s *StructLog) ErrorString() string

ErrorString formats the log's error as a string.

func (StructLog) MarshalJSON

func (s StructLog) MarshalJSON() ([]byte, error)

func (*StructLog) OpName

func (s *StructLog) OpName() string

OpName formats the operand name in a human-readable format.

func (*StructLog) UnmarshalJSON

func (s *StructLog) UnmarshalJSON(input []byte) error

type StructLogger

type StructLogger struct {
	// contains filtered or unexported fields
}

StructLogger is an EVM state logger and implements Tracer.

StructLogger can capture state based on the given Log configuration and also keeps a track record of modified storage which is used in reporting snapshots of the contract their storage.

func NewStructLogger

func NewStructLogger(cfg *LogConfig) *StructLogger

NewStructLogger returns a new logger

func (*StructLogger) CaptureEnd

func (l *StructLogger) CaptureEnd(output []byte, gasUsed uint64, t time.Duration, err error) error

CaptureEnd is called after the call finishes to finalize the tracing.

func (*StructLogger) CaptureFault

func (l *StructLogger) CaptureFault(env *EVM, pc uint64, op OpCode, gas, cost uint64, memory *Memory, stack *Stack, rStack *ReturnStack, contract *Contract, depth int, err error) error

CaptureFault implements the Tracer interface to trace an execution fault while running an opcode.

func (*StructLogger) CaptureStart

func (l *StructLogger) CaptureStart(from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int) error

CaptureStart implements the Tracer interface to initialize the tracing operation.

func (*StructLogger) CaptureState

func (l *StructLogger) CaptureState(env *EVM, pc uint64, op OpCode, gas, cost uint64, memory *Memory, stack *Stack, rStack *ReturnStack, rData []byte, contract *Contract, depth int, err error) error

CaptureState logs a new structured log message and pushes it out to the environment

CaptureState also tracks SLOAD/SSTORE ops to track storage change.

func (*StructLogger) Error

func (l *StructLogger) Error() error

Error returns the VM error captured by the trace.

func (*StructLogger) Output

func (l *StructLogger) Output() []byte

Output returns the VM return value captured by the trace.

func (*StructLogger) StructLogs

func (l *StructLogger) StructLogs() []StructLog

StructLogs returns the captured log entries.

type Tracer

type Tracer interface {
	CaptureStart(from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int) error
	CaptureState(env *EVM, pc uint64, op OpCode, gas, cost uint64, memory *Memory, stack *Stack, rStack *ReturnStack, rData []byte, contract *Contract, depth int, err error) error
	CaptureFault(env *EVM, pc uint64, op OpCode, gas, cost uint64, memory *Memory, stack *Stack, rStack *ReturnStack, contract *Contract, depth int, err error) error
	CaptureEnd(output []byte, gasUsed uint64, t time.Duration, err error) error
}

Tracer is used to collect execution traces from an EVM transaction execution. CaptureState is called for each step of the VM with the current VM state. Note that reference types are actual VM data structures; make copies if you need to retain them beyond the current call.

type TransferFunc

type TransferFunc func(vmcore.StateDB, common.Address, common.Address, *big.Int)

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