fakevm

package
v0.0.2-RC4 Latest Latest
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 Go to latest Published: Feb 15, 2023 License: GPL-3.0 Imports: 9 Imported by: 2

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Index

Constants

View Source 
const (

	// STOP halts execution of the contract
	STOP = 0x00

	// ADD performs (u)int256 addition modulo 2**256
	ADD = 0x01

	// MUL performs (u)int256 multiplication modulo 2**256
	MUL = 0x02

	// SUB performs (u)int256 subtraction modulo 2**256
	SUB = 0x03

	// DIV performs uint256 division
	DIV = 0x04

	// SDIV performs int256 division
	SDIV = 0x05

	// MOD performs uint256 modulus
	MOD = 0x06

	// SMOD performs int256 modulus
	SMOD = 0x07

	// ADDMOD performs (u)int256 addition modulo N
	ADDMOD = 0x08

	// MULMOD performs (u)int256 multiplication modulo N
	MULMOD = 0x09

	// EXP performs uint256 exponentiation modulo 2**256
	EXP = 0x0A

	// SIGNEXTEND performs sign extends x from (b + 1) * 8 bits to 256 bits.
	SIGNEXTEND = 0x0B

	// LT performs int256 comparison
	LT = 0x10

	// GT performs int256 comparison
	GT = 0x11

	// SLT performs int256 comparison
	SLT = 0x12

	// SGT performs int256 comparison
	SGT = 0x13

	// EQ performs (u)int256 equality
	EQ = 0x14

	// ISZERO checks if (u)int256 is zero
	ISZERO = 0x15

	// AND performs 256-bit bitwise and
	AND = 0x16

	// OR performs 256-bit bitwise or
	OR = 0x17

	// XOR performs 256-bit bitwise xor
	XOR = 0x18

	// NOT performs 256-bit bitwise not
	NOT = 0x19

	// BYTE returns the ith byte of (u)int256 x counting from most significant byte
	BYTE = 0x1A

	// SHL performs a shift left
	SHL = 0x1B

	// SHR performs a logical shift right
	SHR = 0x1C

	// SAR performs an arithmetic shift right
	SAR = 0x1D

	// SHA3 performs the keccak256 hash function
	SHA3 = 0x20

	// ADDRESS returns the address of the executing contract
	ADDRESS = 0x30

	// BALANCE returns the address balance in wei
	BALANCE = 0x31

	// ORIGIN returns the transaction origin address
	ORIGIN = 0x32

	// CALLER returns the message caller address
	CALLER = 0x33

	// CALLVALUE returns the message funds in wei
	CALLVALUE = 0x34

	// CALLDATALOAD reads a (u)int256 from message data
	CALLDATALOAD = 0x35

	// CALLDATASIZE returns the message data length in bytes
	CALLDATASIZE = 0x36

	// CALLDATACOPY copies the message data
	CALLDATACOPY = 0x37

	// CODESIZE returns the length of the executing contract's code in bytes
	CODESIZE = 0x38

	// CODECOPY copies the executing contract bytecode
	CODECOPY = 0x39

	// GASPRICE returns the gas price of the executing transaction, in wei per unit of gas
	GASPRICE = 0x3A

	// EXTCODESIZE returns the length of the contract bytecode at addr
	EXTCODESIZE = 0x3B

	// EXTCODECOPY copies the contract bytecode
	EXTCODECOPY = 0x3C

	// RETURNDATASIZE returns the size of the returned data from the last external call in bytes
	RETURNDATASIZE = 0x3D

	// RETURNDATACOPY copies the returned data
	RETURNDATACOPY = 0x3E

	// EXTCODEHASH returns the hash of the specified contract bytecode
	EXTCODEHASH = 0x3F

	// BLOCKHASH returns the hash of the specific block. Only valid for the last 256 most recent blocks
	BLOCKHASH = 0x40

	// COINBASE returns the address of the current block's miner
	COINBASE = 0x41

	// TIMESTAMP returns the current block's Unix timestamp in seconds
	TIMESTAMP = 0x42

	// NUMBER returns the current block's number
	NUMBER = 0x43

	// DIFFICULTY returns the current block's difficulty
	DIFFICULTY = 0x44

	// GASLIMIT returns the current block's gas limit
	GASLIMIT = 0x45

	// CHAINID returns the id of the chain
	CHAINID = 0x46

	// SELFBALANCE returns the balance of the current account
	SELFBALANCE = 0x47

	// POP pops a (u)int256 off the stack and discards it
	POP = 0x50

	// MLOAD reads a (u)int256 from memory
	MLOAD = 0x51

	// MSTORE writes a (u)int256 to memory
	MSTORE = 0x52

	// MSTORE8 writes a uint8 to memory
	MSTORE8 = 0x53

	// SLOAD reads a (u)int256 from storage
	SLOAD = 0x54

	// SSTORE writes a (u)int256 to storage
	SSTORE = 0x55

	// JUMP performs an unconditional jump
	JUMP = 0x56

	// JUMPI performs a conditional jump if condition is truthy
	JUMPI = 0x57

	// PC returns the program counter
	PC = 0x58

	// MSIZE returns the size of memory for this contract execution, in bytes
	MSIZE = 0x59

	// GAS returns the remaining gas
	GAS = 0x5A

	// JUMPDEST corresponds to a possible jump destination
	JUMPDEST = 0x5B

	// PUSH1 pushes a 1-byte value onto the stack
	PUSH1 = 0x60

	// PUSH2 pushes a 2-bytes value onto the stack
	PUSH2 = 0x61

	// PUSH3 pushes a 3-bytes value onto the stack
	PUSH3 = 0x62

	// PUSH4 pushes a 4-bytes value onto the stack
	PUSH4 = 0x63

	// PUSH5 pushes a 5-bytes value onto the stack
	PUSH5 = 0x64

	// PUSH6 pushes a 6-bytes value onto the stack
	PUSH6 = 0x65

	// PUSH7 pushes a 7-bytes value onto the stack
	PUSH7 = 0x66

	// PUSH8 pushes a 8-bytes value onto the stack
	PUSH8 = 0x67

	// PUSH9 pushes a 9-bytes value onto the stack
	PUSH9 = 0x68

	// PUSH10 pushes a 10-bytes value onto the stack
	PUSH10 = 0x69

	// PUSH11 pushes a 11-bytes value onto the stack
	PUSH11 = 0x6A

	// PUSH12 pushes a 12-bytes value onto the stack
	PUSH12 = 0x6B

	// PUSH13 pushes a 13-bytes value onto the stack
	PUSH13 = 0x6C

	// PUSH14 pushes a 14-bytes value onto the stack
	PUSH14 = 0x6D

	// PUSH15 pushes a 15-bytes value onto the stack
	PUSH15 = 0x6E

	// PUSH16 pushes a 16-bytes value onto the stack
	PUSH16 = 0x6F

	// PUSH17 pushes a 17-bytes value onto the stack
	PUSH17 = 0x70

	// PUSH18 pushes a 18-bytes value onto the stack
	PUSH18 = 0x71

	// PUSH19 pushes a 19-bytes value onto the stack
	PUSH19 = 0x72

	// PUSH20 pushes a 20-bytes value onto the stack
	PUSH20 = 0x73

	// PUSH21 pushes a 21-bytes value onto the stack
	PUSH21 = 0x74

	// PUSH22 pushes a 22-bytes value onto the stack
	PUSH22 = 0x75

	// PUSH23 pushes a 23-bytes value onto the stack
	PUSH23 = 0x76

	// PUSH24 pushes a 24-bytes value onto the stack
	PUSH24 = 0x77

	// PUSH25 pushes a 25-bytes value onto the stack
	PUSH25 = 0x78

	// PUSH26 pushes a 26-bytes value onto the stack
	PUSH26 = 0x79

	// PUSH27 pushes a 27-bytes value onto the stack
	PUSH27 = 0x7A

	// PUSH28 pushes a 28-bytes value onto the stack
	PUSH28 = 0x7B

	// PUSH29 pushes a 29-bytes value onto the stack
	PUSH29 = 0x7C

	// PUSH30 pushes a 30-bytes value onto the stack
	PUSH30 = 0x7D

	// PUSH31 pushes a 31-bytes value onto the stack
	PUSH31 = 0x7E

	// PUSH32 pushes a 32-byte value onto the stack
	PUSH32 = 0x7F

	// DUP1 clones the last value on the stack
	DUP1 = 0x80

	// DUP2 clones the 2nd last value on the stack
	DUP2 = 0x81

	// DUP3 clones the 3rd last value on the stack
	DUP3 = 0x82

	// DUP4 clones the 4th last value on the stack
	DUP4 = 0x83

	// DUP5 clones the 5th last value on the stack
	DUP5 = 0x84

	// DUP6 clones the 6th last value on the stack
	DUP6 = 0x85

	// DUP7 clones the 7th last value on the stack
	DUP7 = 0x86

	// DUP8 clones the 8th last value on the stack
	DUP8 = 0x87

	// DUP9 clones the 9th last value on the stack
	DUP9 = 0x88

	// DUP10 clones the 10th last value on the stack
	DUP10 = 0x89

	// DUP11 clones the 11th last value on the stack
	DUP11 = 0x8A

	// DUP12 clones the 12th last value on the stack
	DUP12 = 0x8B

	// DUP13 clones the 13th last value on the stack
	DUP13 = 0x8C

	// DUP14 clones the 14th last value on the stack
	DUP14 = 0x8D

	// DUP15 clones the 15th last value on the stack
	DUP15 = 0x8E

	// DUP16 clones the 16th last value on the stack
	DUP16 = 0x8F

	// SWAP1 swaps the last two values on the stack
	SWAP1 = 0x90

	// SWAP2 swaps the top of the stack with the 3rd last element
	SWAP2 = 0x91

	// SWAP3 swaps the top of the stack with the 4th last element
	SWAP3 = 0x92

	// SWAP4 swaps the top of the stack with the 5th last element
	SWAP4 = 0x93

	// SWAP5 swaps the top of the stack with the 6th last element
	SWAP5 = 0x94

	// SWAP6 swaps the top of the stack with the 7th last element
	SWAP6 = 0x95

	// SWAP7 swaps the top of the stack with the 8th last element
	SWAP7 = 0x96

	// SWAP8 swaps the top of the stack with the 9th last element
	SWAP8 = 0x97

	// SWAP9 swaps the top of the stack with the 10th last element
	SWAP9 = 0x98

	// SWAP10 swaps the top of the stack with the 11th last element
	SWAP10 = 0x99

	// SWAP11 swaps the top of the stack with the 12th last element
	SWAP11 = 0x9A

	// SWAP12 swaps the top of the stack with the 13th last element
	SWAP12 = 0x9B

	// SWAP13 swaps the top of the stack with the 14th last element
	SWAP13 = 0x9C

	// SWAP14 swaps the top of the stack with the 15th last element
	SWAP14 = 0x9D

	// SWAP15 swaps the top of the stack with the 16th last element
	SWAP15 = 0x9E

	// SWAP16 swaps the top of the stack with the 17th last element
	SWAP16 = 0x9F

	// LOG0 fires an event without topics
	LOG0 = 0xA0

	// LOG1 fires an event with one topic
	LOG1 = 0xA1

	// LOG2 fires an event with two topics
	LOG2 = 0xA2

	// LOG3 fires an event with three topics
	LOG3 = 0xA3

	// LOG4 fires an event with four topics
	LOG4 = 0xA4

	// CREATE creates a child contract
	CREATE = 0xF0

	// CALL calls a method in another contract
	CALL = 0xF1

	// CALLCODE calls a method in another contract
	CALLCODE = 0xF2

	// RETURN returns from this contract call
	RETURN = 0xF3

	// DELEGATECALL calls a method in another contract using the storage of the current contract
	DELEGATECALL = 0xF4

	// CREATE2 creates a child contract with a salt
	CREATE2 = 0xF5

	// STATICCALL calls a method in another contract
	STATICCALL = 0xFA

	// REVERT reverts with return data
	REVERT = 0xFD

	// SELFDESTRUCT destroys the contract and sends all funds to addr
	SELFDESTRUCT = 0xFF
)
View Source 
const InitialStackSize int = 16

InitialStackSize represents the initial stack size.

View Source 
const MemoryItemSize int = 32

MemoryItemSize is the memory item size.

Variables

This section is empty.

Functions

This section is empty.

Types

type Account 

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

Account represents a fake EVM account.

func NewAccount 

func NewAccount(address common.Address) *Account

NewAccount is the Account constructor.

func (*Account) Address 

func (a *Account) Address() common.Address

Address is the address getter.

type Config 

type Config struct {
	Debug                   bool      // Enables debugging
	Tracer                  EVMLogger // Opcode logger
	NoBaseFee               bool      // Forces the EIP-1559 baseFee to 0 (needed for 0 price calls)
	EnablePreimageRecording bool      // Enables recording of SHA3/keccak preimages

	JumpTable *vm.JumpTable // EVM instruction table, automatically populated if unset

	ExtraEips []int // Additional EIPS that are to be enabled
}

Config are the configuration options for the Interpreter

type EVMLogger 

type EVMLogger interface {
	// Transaction level
	CaptureTxStart(gasLimit uint64)
	CaptureTxEnd(restGas uint64)
	// Top call frame
	CaptureStart(env *FakeEVM, from common.Address, to common.Address, create bool, input []byte, gas uint64, value *big.Int)
	CaptureState(pc uint64, op vm.OpCode, gas, cost uint64, scope *ScopeContext, rData []byte, depth int, err error)
	// Rest of call frames
	CaptureEnter(typ vm.OpCode, from common.Address, to common.Address, input []byte, gas uint64, value *big.Int)
	CaptureExit(output []byte, gasUsed uint64, err error)
	// Opcode level
	CaptureFault(pc uint64, op vm.OpCode, gas, cost uint64, scope *ScopeContext, depth int, err error)
	CaptureEnd(output []byte, gasUsed uint64, t time.Duration, err error)
}

EVMLogger 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 FakeDB 

type FakeDB interface {
	SetStateRoot(stateRoot []byte)
	GetBalance(address common.Address) *big.Int
	GetNonce(address common.Address) uint64
	GetCode(address common.Address) []byte
	GetState(address common.Address, hash common.Hash) common.Hash
	Exist(address common.Address) bool
	GetCodeHash(address common.Address) common.Hash
}

FakeDB is the interface state access for the FakeEVM

type FakeEVM 

type FakeEVM struct {
	// Context provides auxiliary blockchain related information
	Context vm.BlockContext
	vm.TxContext
	// StateDB gives access to the underlying state
	StateDB FakeDB

	// virtual machine configuration options used to initialise the
	// evm.
	Config Config
	// contains filtered or unexported fields
}

FakeEVM represents the fake EVM.

func NewFakeEVM 

func NewFakeEVM(blockCtx vm.BlockContext, txCtx vm.TxContext, chainConfig *params.ChainConfig, config Config) *FakeEVM

NewFakeEVM returns a new EVM. The returned EVM is not thread safe and should only ever be used *once*. func NewFakeEVM(blockCtx vm.BlockContext, txCtx vm.TxContext, statedb runtime.FakeDB, chainConfig *params.ChainConfig, config Config) *FakeEVM {

func (*FakeEVM) Cancel 

func (evm *FakeEVM) Cancel()

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

func (*FakeEVM) ChainConfig 

func (evm *FakeEVM) ChainConfig() *params.ChainConfig

ChainConfig returns the environment's chain configuration

func (*FakeEVM) SetStateDB 

func (evm *FakeEVM) SetStateDB(stateDB FakeDB)

SetStateDB is the StateDB setter.

type Memory 

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

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

func NewMemory 

func NewMemory() *Memory

NewMemory returns a new memory model.

func (*Memory) Data 

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

Data returns the backing slice

func (*Memory) GetCopy 

func (m *Memory) GetCopy(offset, size int64) (cpy []byte)

GetCopy returns offset + size as a new slice

func (*Memory) GetPtr 

func (m *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()

Print dumps the content of the memory.

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

func (*Memory) Set32 

func (m *Memory) Set32(offset uint64, val *uint256.Int)

Set32 sets the 32 bytes starting at offset to the value of val, left-padded with zeroes to 32 bytes.

type OpCode 

type OpCode byte

OpCode is the EVM opcode

func (OpCode) String 

func (op OpCode) String() string

type ScopeContext 

type ScopeContext struct {
	Memory   *Memory
	Stack    *Stack
	Contract *vm.Contract
}

ScopeContext contains the things that are per-call, such as stack and memory, but not transients like pc and gas

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 Newstack 

func Newstack() *Stack

Newstack gets a stack from the pool.

func (*Stack) Back 

func (st *Stack) Back(n int) *uint256.Int

Back returns the n'th item in stack

func (*Stack) Data 

func (st *Stack) Data() []uint256.Int

Data returns the underlying uint256.Int array.

func (*Stack) Print 

func (st *Stack) Print()

Print dumps the content of the stack

func (*Stack) Push 

func (st *Stack) Push(d *uint256.Int)

Push adds an item to the data.

Source Files

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