evm

Documentation

Index

• Constants
• func Is64BitOverflow(word Word256) bool
• type Contract
  • func (c *Contract) Call(state engine.State, params engine.CallParams) ([]byte, error)
• type EVM
  • func Default() *EVM
  • func New(options Options) *EVM
  • func (vm *EVM) Contract(code []byte) *Contract
  • func (vm *EVM) Dispatch(acc *acm.Account) engine.Callable
  • func (vm *EVM) Execute(st acmstate.ReaderWriter, blockchain engine.Blockchain, ...) ([]byte, error)
  • func (vm *EVM) SetExternals(externals engine.Dispatcher)
  • func (vm *EVM) SetLogger(logger *logging.Logger)
  • func (vm *EVM) SetNonce(nonce []byte)
• type Memory
  • func DefaultDynamicMemoryProvider(errSink errors.Sink) Memory
  • func NewDynamicMemory(initialCapacity, maximumCapacity uint64, errSink errors.Sink) Memory
• type Options
• type Stack
  • func NewStack(errSink errors.Sink, initialCapacity uint64, maxCapacity uint64, gas *uint64) *Stack
  • func (st *Stack) Dup(n int)
  • func (st *Stack) Len() int
  • func (st *Stack) Peek() Word256
  • func (st *Stack) Pop() Word256
  • func (st *Stack) Pop64() uint64
  • func (st *Stack) PopAddress() crypto.Address
  • func (st *Stack) PopBigInt() *big.Int
  • func (st *Stack) PopBigIntSigned() *big.Int
  • func (st *Stack) PopBytes() []byte
  • func (st *Stack) Print(n int)
  • func (st *Stack) Push(d Word256)
  • func (st *Stack) Push64(i uint64)
  • func (st *Stack) PushAddress(address crypto.Address)
  • func (st *Stack) PushBigInt(bigInt *big.Int) Word256
  • func (st *Stack) PushBytes(bz []byte)
  • func (st *Stack) Swap(n int)

Constants

const (
	DataStackInitialCapacity    = 1024
	MaximumAllowedBlockLookBack = 256
)

Functions

func Is64BitOverflow

func Is64BitOverflow(word Word256) bool

Types

type Contract

type Contract struct {
	*EVM
	// contains filtered or unexported fields
}

func (*Contract) Call

func (c *Contract) Call(state engine.State, params engine.CallParams) ([]byte, error)

type EVM

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

func Default

func Default() *EVM

func New

func New(options Options) *EVM

func (*EVM) Contract

func (vm *EVM) Contract(code []byte) *Contract

func (*EVM) Dispatch

func (vm *EVM) Dispatch(acc *acm.Account) engine.Callable

func (*EVM) Execute

func (vm *EVM) Execute(st acmstate.ReaderWriter, blockchain engine.Blockchain, eventSink exec.EventSink,
	params engine.CallParams, code []byte) ([]byte, error)

Initiate an EVM call against the provided state pushing events to eventSink. code should contain the EVM bytecode, input the CallData (readable by CALLDATALOAD), value the amount of native token to transfer with the call an quantity metering the number of computational steps available to the execution according to the gas schedule.

func (*EVM) SetExternals

func (vm *EVM) SetExternals(externals engine.Dispatcher)

func (*EVM) SetLogger

func (vm *EVM) SetLogger(logger *logging.Logger)

func (*EVM) SetNonce

func (vm *EVM) SetNonce(nonce []byte)

Sets a new nonce and resets the sequence number. Nonces should only be used once! A global counter or sufficient randomness will work.

type Memory

type Memory interface {
	// Read a value from the memory store starting at offset
	// (index of first byte will equal offset). The value will be returned as a
	// length-bytes byte slice. Returns an error if the memory cannot be read or
	// is not allocated.
	//
	// The value returned should be copy of any underlying memory, not a reference
	// to the underlying store.
	Read(offset, length *big.Int) []byte
	// Write a value to the memory starting at offset (the index of the first byte
	// written will equal offset). The value is provided as bytes to be written
	// consecutively to the memory store. Return an error if the memory cannot be
	// written or allocated.
	Write(offset *big.Int, value []byte)
	// Returns the current capacity of the memory. For dynamically allocating
	// memory this capacity can be used as a write offset that is guaranteed to be
	// unused. Solidity in particular makes this assumption when using MSIZE to
	// get the current allocated memory.
	Capacity() *big.Int
}

Interface for a bounded linear memory indexed by a single *big.Int parameter for each byte in the memory.

func DefaultDynamicMemoryProvider

func DefaultDynamicMemoryProvider(errSink errors.Sink) Memory

func NewDynamicMemory

func NewDynamicMemory(initialCapacity, maximumCapacity uint64, errSink errors.Sink) Memory

Get a new DynamicMemory (note that although we take a maximumCapacity of uint64 we currently limit the maximum to int32 at runtime because we are using a single slice which we cannot guarantee to be indexable above int32 or all validators

type Options

type Options struct {
	MemoryProvider           func(errors.Sink) Memory
	Natives                  *native.Natives
	Nonce                    []byte
	DebugOpcodes             bool
	DumpTokens               bool
	CallStackMaxDepth        uint64
	DataStackInitialCapacity uint64
	DataStackMaxDepth        uint64
	Logger                   *logging.Logger
}

Options are parameters that are generally stable across a burrow configuration. Defaults will be used for any zero values.

type Stack

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

Not goroutine safe

func NewStack

func NewStack(errSink errors.Sink, initialCapacity uint64, maxCapacity uint64, gas *uint64) *Stack

func (*Stack) Dup

func (st *Stack) Dup(n int)

func (*Stack) Len

func (st *Stack) Len() int

func (*Stack) Peek

func (st *Stack) Peek() Word256

Not an opcode, costs no gas.

func (*Stack) Pop

func (st *Stack) Pop() Word256

func (*Stack) Pop64

func (st *Stack) Pop64() uint64

func (*Stack) PopAddress

func (st *Stack) PopAddress() crypto.Address

func (*Stack) PopBigInt

func (st *Stack) PopBigInt() *big.Int

func (*Stack) PopBigIntSigned

func (st *Stack) PopBigIntSigned() *big.Int

func (*Stack) PopBytes

func (st *Stack) PopBytes() []byte

func (*Stack) Print

func (st *Stack) Print(n int)

func (*Stack) Push

func (st *Stack) Push(d Word256)

func (*Stack) Push64

func (st *Stack) Push64(i uint64)

func (*Stack) PushAddress

func (st *Stack) PushAddress(address crypto.Address)

func (*Stack) PushBigInt

func (st *Stack) PushBigInt(bigInt *big.Int) Word256

Pushes the bigInt as a Word256 encoding negative values in 32-byte twos complement and returns the encoded result

func (*Stack) PushBytes

func (st *Stack) PushBytes(bz []byte)

currently only called after sha3.Sha3

func (*Stack) Swap

func (st *Stack) Swap(n int)