vm

package
v1.0.4 Latest Latest
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 Go to latest Published: Sep 2, 2015 License: GPL-3.0 Imports: 12 Imported by: 0

Documentation

Overview

Package vm implements the Ethereum Virtual Machine.

Index

Constants

View Source 
const (
	StdVmTy Type = iota
	JitVmTy
	MaxVmTy

	LogTyPretty byte = 0x1
	LogTyDiff   byte = 0x2
)

Variables

View Source 
var (
	Pow256 = common.BigPow(2, 256)

	U256 = common.U256
	S256 = common.S256

	Zero = common.Big0
	One  = common.Big1
)
View Source 
var (
	GasQuickStep   = big.NewInt(2)
	GasFastestStep = big.NewInt(3)
	GasFastStep    = big.NewInt(5)
	GasMidStep     = big.NewInt(8)
	GasSlowStep    = big.NewInt(10)
	GasExtStep     = big.NewInt(20)

	GasReturn = big.NewInt(0)
	GasStop   = big.NewInt(0)

	GasContractByte = big.NewInt(200)
)
View Source 
var Debug bool

Global Debug flag indicating Debug VM (full logging)

View Source 
var DepthError = fmt.Errorf("Max call depth exceeded (%d)", params.CallCreateDepth)
View Source 
var OutOfGasError = errors.New("Out of gas")
View Source 
var Precompiled = PrecompiledContracts()

Functions

func Disasm 

func Disasm(code []byte) []string

func Disassemble 

func Disassemble(script []byte) (asm []string)

func IsStackErr 

func IsStackErr(err error) bool

func PrecompiledContracts 

func PrecompiledContracts() map[string]*PrecompiledAccount

XXX Could set directly. Testing requires resetting and setting of pre compiled contracts.

func StdErrFormat 

func StdErrFormat(logs []StructLog)

func Transfer 

func Transfer(from, to Account, amount *big.Int) error

generic transfer method

func UseGas 

func UseGas(gas, amount *big.Int) bool

Types

type Account 

type Account interface {
	SubBalance(amount *big.Int)
	AddBalance(amount *big.Int)
	Balance() *big.Int
	Address() common.Address
}

type Address 

type Address interface {
	Call(in []byte) []byte
}

type Context 

type Context struct {
	Code     []byte
	CodeAddr *common.Address

	Gas, UsedGas, Price *big.Int

	Args []byte
	// contains filtered or unexported fields
}

func NewContext 

func NewContext(caller ContextRef, object ContextRef, value, gas, price *big.Int) *Context

Create a new context for the given data items.

func (*Context) Address 

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

* Set / Get

func (*Context) GetByte 

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

func (*Context) GetOp 

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

func (*Context) Return 

func (c *Context) Return(ret []byte) []byte

func (*Context) ReturnGas 

func (c *Context) ReturnGas(gas, price *big.Int)

Implement the caller interface

func (*Context) SetCallCode 

func (self *Context) SetCallCode(addr *common.Address, code []byte)

func (*Context) SetCode 

func (self *Context) SetCode(code []byte)

func (*Context) UseGas 

func (c *Context) UseGas(gas *big.Int) (ok bool)

* Gas functions

type ContextRef 

type ContextRef interface {
	ReturnGas(*big.Int, *big.Int)
	Address() common.Address
	SetCode([]byte)
}

type Environment 

type Environment interface {
	State() *state.StateDB

	Origin() common.Address
	BlockNumber() *big.Int
	GetHash(n uint64) common.Hash
	Coinbase() common.Address
	Time() *big.Int
	Difficulty() *big.Int
	GasLimit() *big.Int
	Transfer(from, to Account, amount *big.Int) error
	AddLog(*state.Log)
	AddStructLog(StructLog)
	StructLogs() []StructLog

	VmType() Type

	Depth() int
	SetDepth(i int)

	Call(me ContextRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error)
	CallCode(me ContextRef, addr common.Address, data []byte, gas, price, value *big.Int) ([]byte, error)
	Create(me ContextRef, data []byte, gas, price, value *big.Int) ([]byte, error, ContextRef)
}

Environment is is required by the virtual machine to get information from it's own isolated environment. For an example see `core.VMEnv`

type Memory 

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

func NewMemory 

func NewMemory() *Memory

func (*Memory) Data 

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

func (*Memory) Get 

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

func (*Memory) GetPtr 

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

func (*Memory) Len 

func (m *Memory) Len() int

func (*Memory) Print 

func (m *Memory) Print()

func (*Memory) Resize 

func (m *Memory) Resize(size uint64)

func (*Memory) Set 

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

type OpCode 

type OpCode byte
const (
	// 0x0 range - arithmetic ops
	STOP OpCode = iota
	ADD
	MUL
	SUB
	DIV
	SDIV
	MOD
	SMOD
	ADDMOD
	MULMOD
	EXP
	SIGNEXTEND
)

Op codes 

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

	SHA3 = 0x20
)
const (
	// 0x30 range - closure state
	ADDRESS OpCode = 0x30 + iota
	BALANCE
	ORIGIN
	CALLER
	CALLVALUE
	CALLDATALOAD
	CALLDATASIZE
	CALLDATACOPY
	CODESIZE
	CODECOPY
	GASPRICE
	EXTCODESIZE
	EXTCODECOPY
)
const (

	// 0x40 range - block operations
	BLOCKHASH OpCode = 0x40 + iota
	COINBASE
	TIMESTAMP
	NUMBER
	DIFFICULTY
	GASLIMIT
)
const (
	// 0x50 range - 'storage' and execution
	POP OpCode = 0x50 + iota
	MLOAD
	MSTORE
	MSTORE8
	SLOAD
	SSTORE
	JUMP
	JUMPI
	PC
	MSIZE
	GAS
	JUMPDEST
)
const (
	// 0x60 range
	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
)
const (
	LOG0 OpCode = 0xa0 + iota
	LOG1
	LOG2
	LOG3
	LOG4
)
const (
	// 0xf0 range - closures
	CREATE OpCode = 0xf0 + iota
	CALL
	CALLCODE
	RETURN

	// 0x70 range - other
	SUICIDE = 0xff
)

func StringToOp 

func StringToOp(str string) OpCode

func (OpCode) String 

func (o OpCode) String() string

type PrecompiledAccount 

type PrecompiledAccount struct {
	Gas func(l int) *big.Int
	// contains filtered or unexported fields
}

func (PrecompiledAccount) Call 

func (self PrecompiledAccount) Call(in []byte) []byte

type StackError 

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

func StackErr 

func StackErr(req, has int) StackError

func (StackError) Error 

func (self StackError) Error() string

type StructLog 

type StructLog struct {
	Pc      uint64
	Op      OpCode
	Gas     *big.Int
	GasCost *big.Int
	Memory  []byte
	Stack   []*big.Int
	Storage map[common.Hash][]byte
	Err     error
}

StructLog is emited to the Environment each cycle and lists information about the curent internal state prior to the execution of the statement.

type Type 

type Type byte

type VirtualMachine 

type VirtualMachine interface {
	Env() Environment
	Run(context *Context, data []byte) ([]byte, error)
}

func NewJitVm 

func NewJitVm(env Environment) VirtualMachine

func NewVm 

func NewVm(env Environment) VirtualMachine

type Vm 

type Vm struct {
	BreakPoints []int64
	Stepping    bool
	Fn          string

	Recoverable bool

	// Will be called before the vm returns
	After func(*Context, error)
	// contains filtered or unexported fields
}

Vm implements VirtualMachine

func New 

func New(env Environment) *Vm

New returns a new Virtual Machine

func (*Vm) Env 

func (self *Vm) Env() Environment

Environment returns the current workable state of the VM

func (*Vm) Run 

func (self *Vm) Run(context *Context, input []byte) (ret []byte, err error)

Run loops and evaluates the contract's code with the given input data

func (*Vm) RunPrecompiled 

func (self *Vm) RunPrecompiled(p *PrecompiledAccount, input []byte, context *Context) (ret []byte, err error)

RunPrecompile runs and evaluate the output of a precompiled contract defined in contracts.go

Source Files

View all Source files

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