evm

package
v0.21.0 Latest Latest
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 Go to latest Published: Aug 21, 2018 License: Apache-2.0 Imports: 22 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	GasSha3          uint64 = 1
	GasGetAccount    uint64 = 1
	GasStorageUpdate uint64 = 1
	GasCreateAccount uint64 = 1

	GasBaseOp  uint64 = 0 // TODO: make this 1
	GasStackOp uint64 = 1

	GasEcRecover     uint64 = 1
	GasSha256Word    uint64 = 1
	GasSha256Base    uint64 = 1
	GasRipemd160Word uint64 = 1
	GasRipemd160Base uint64 = 1
	GasIdentityWord  uint64 = 1
	GasIdentityBase  uint64 = 1
)

Variables

This section is empty.

Functions

func DebugOpcodes 

func DebugOpcodes(vm *VM)

func DeriveNewAccount 

func DeriveNewAccount(creator *acm.MutableAccount, permissions permission.AccountPermissions,
	logger *logging.Logger) *acm.MutableAccount

Create a new account from a parent 'creator' account. The creator account will have its sequence number incremented

func DumpTokens 

func DumpTokens(vm *VM)

func ExecuteNativeContract added in v0.19.0 

func ExecuteNativeContract(address Word256, state state.ReaderWriter, caller acm.Account, input []byte, gas *uint64,
	logger *logging.Logger) ([]byte, errors.CodedError)

func HasPermission 

func HasPermission(stateWriter state.ReaderWriter, acc acm.Account, perm permission.PermFlag) bool

CONTRACT: it is the duty of the contract writer to call known permissions we do not convey if a permission is not set (unlike in state/execution, where we guarantee HasPermission is called on known permissions and panics else) If the perm is not defined in the acc nor set by default in GlobalPermissions, this function returns false.

func Is64BitOverflow 

func Is64BitOverflow(word Word256) bool

func IsRegisteredNativeContract added in v0.19.0 

func IsRegisteredNativeContract(address Word256) bool

func MemoryProvider 

func MemoryProvider(memoryProvider func() Memory) func(*VM)

func RegisterNativeContract 

func RegisterNativeContract(addr Word256, fn NativeContract) bool

func SNativeContracts 

func SNativeContracts() map[string]*SNativeContractDescription

Returns a map of all SNative contracts defined indexed by name

Types

type EventSink added in v0.20.0 

type EventSink interface {
	Call(call *exec.CallEvent, exception *errors.Exception)
	Log(log *exec.LogEvent)
}

type FakeAppState 

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

func (*FakeAppState) GetAccount 

func (fas *FakeAppState) GetAccount(addr crypto.Address) (acm.Account, error)

func (*FakeAppState) GetStorage 

func (fas *FakeAppState) GetStorage(addr crypto.Address, key Word256) (Word256, error)

func (*FakeAppState) RemoveAccount 

func (fas *FakeAppState) RemoveAccount(address crypto.Address) error

func (*FakeAppState) SetStorage 

func (fas *FakeAppState) SetStorage(addr crypto.Address, key Word256, value Word256) error

func (*FakeAppState) UpdateAccount 

func (fas *FakeAppState) UpdateAccount(account acm.Account) error

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, error)
	// 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) error
	// 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() Memory

func NewDynamicMemory 

func NewDynamicMemory(initialCapacity, maximumCapacity uint64) 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 NativeContract 

type NativeContract func(state state.ReaderWriter, caller acm.Account, input []byte, gas *uint64,
	logger *logging.Logger) (output []byte, err error)

type Params 

type Params struct {
	BlockHeight uint64
	BlockHash   Word256
	BlockTime   int64
	GasLimit    uint64
}

type SNativeContractDescription 

type SNativeContractDescription struct {
	// Comment describing purpose of SNative contract and reason for assembling
	// the particular functions
	Comment string
	// Name of the SNative contract
	Name string
	// contains filtered or unexported fields
}

Metadata for SNative contract. Acts as a call target from the EVM. Can be used to generate bindings in a smart contract languages.

func NewSNativeContract 

func NewSNativeContract(comment, name string,
	functions ...*SNativeFunctionDescription) *SNativeContractDescription

Create a new SNative contract description object by passing a comment, name and a list of member functions descriptions

func (*SNativeContractDescription) Address 

func (contract *SNativeContractDescription) Address() (address crypto.Address)

We define the address of an SNative contact as the last 20 bytes of the sha3 hash of its name

func (*SNativeContractDescription) Dispatch 

func (contract *SNativeContractDescription) Dispatch(state state.ReaderWriter, caller acm.Account,
	args []byte, gas *uint64, logger *logging.Logger) (output []byte, err error)

This function is designed to be called from the EVM once a SNative contract has been selected. It is also placed in a registry by registerSNativeContracts So it can be looked up by SNative address

func (*SNativeContractDescription) FunctionByID 

func (contract *SNativeContractDescription) FunctionByID(id abi.FunctionID) (*SNativeFunctionDescription, errors.CodedError)

Get function by calling identifier FunctionSelector

func (*SNativeContractDescription) FunctionByName 

func (contract *SNativeContractDescription) FunctionByName(name string) (*SNativeFunctionDescription, error)

Get function by name

func (*SNativeContractDescription) Functions 

func (contract *SNativeContractDescription) Functions() []*SNativeFunctionDescription

Get functions in order of declaration

type SNativeFunctionDescription 

type SNativeFunctionDescription struct {
	// Comment describing function's purpose, parameters, and return value
	Comment string
	// Function name (used to form signature)
	Name string
	// Function arguments
	Arguments reflect.Type
	// Function return values
	Returns reflect.Type
	// The abi
	Abi abi.FunctionSpec
	// Permissions required to call function
	PermFlag permission.PermFlag
	// Native function to which calls will be dispatched when a containing
	F func(stateWriter state.ReaderWriter, caller acm.Account, gas *uint64,
		logger *logging.Logger, v interface{}) (interface{}, error)
}

Metadata for SNative functions. Act as call targets for the EVM when collected into an SNativeContractDescription. Can be used to generate bindings in a smart contract languages.

func (*SNativeFunctionDescription) NArgs 

func (function *SNativeFunctionDescription) NArgs() int

Get number of function arguments

func (*SNativeFunctionDescription) Signature 

func (function *SNativeFunctionDescription) Signature() string

Get function signature

type Stack 

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

Not goroutine safe

func NewStack 

func NewStack(capacity int, gas *uint64, err *errors.CodedError) *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() (int64, errors.CodedError)

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) PopU64 

func (st *Stack) PopU64() (uint64, errors.CodedError)

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 int64)

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) PushU64 

func (st *Stack) PushU64(i uint64)

func (*Stack) Swap 

func (st *Stack) Swap(n int)

type VM 

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

func NewVM 

func NewVM(params Params, origin crypto.Address, tx *txs.Tx, logger *logging.Logger, options ...func(*VM)) *VM

func (*VM) Call 

func (vm *VM) Call(callState *state.Cache, caller, callee *acm.MutableAccount, code, input []byte, value uint64,
	gas *uint64) (output []byte, err errors.CodedError)

CONTRACT state is aware of caller and callee, so we can just mutate them. CONTRACT code and input are not mutated. CONTRACT returned 'ret' is a new compact slice. value: To be transferred from caller to callee. Refunded upon errors.CodedError. gas: Available gas. No refunds for gas. code: May be nil, since the CALL opcode may be used to send value from contracts to accounts

func (*VM) Debugf 

func (vm *VM) Debugf(format string, a ...interface{})

func (*VM) DelegateCall 

func (vm *VM) DelegateCall(callState *state.Cache, caller acm.Account, callee *acm.MutableAccount, code, input []byte, value uint64, gas *uint64) (output []byte, err errors.CodedError)

DelegateCall is executed by the DELEGATECALL opcode, introduced as off Ethereum Homestead. The intent of delegate call is to run the code of the callee in the storage context of the caller; while preserving the original caller to the previous callee. Different to the normal CALL or CALLCODE, the value does not need to be transferred to the callee.

func (*VM) SetEventSink added in v0.20.0 

func (vm *VM) SetEventSink(em EventSink)

Set EventSink destination for events - can be unset if events generation is not required

Source Files

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Directories

Path Synopsis
asm
bc

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