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runtime.go
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runtime.go
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package runtime
import (
"errors"
"math/big"
"github.com/dogechain-lab/dogechain/chain"
"github.com/dogechain-lab/dogechain/types"
)
// TxContext is the context of the transaction
type TxContext struct {
GasPrice types.Hash
Origin types.Address
Coinbase types.Address
Number int64
Timestamp int64
GasLimit int64
ChainID int64
Difficulty types.Hash
}
// StorageStatus is the status of the storage access
type StorageStatus int
const (
// StorageUnchanged if the data has not changed
StorageUnchanged StorageStatus = iota
// StorageModified if the value has been modified
StorageModified
// StorageModifiedAgain if the value has been modified before in the txn
StorageModifiedAgain
// StorageAdded if this is a new entry in the storage
StorageAdded
// StorageDeleted if the storage was deleted
StorageDeleted
// StorageReadFailed if the storage read failed
StorageReadFailed
)
func (s StorageStatus) String() string {
switch s {
case StorageUnchanged:
return "StorageUnchanged"
case StorageModified:
return "StorageModified"
case StorageModifiedAgain:
return "StorageModifiedAgain"
case StorageAdded:
return "StorageAdded"
case StorageDeleted:
return "StorageDeleted"
default:
panic("BUG: storage status not found")
}
}
// Host is the execution host
type Host interface {
AccountExists(addr types.Address) bool
GetStorage(addr types.Address, key types.Hash) (types.Hash, error)
SetStorage(addr types.Address, key types.Hash, value types.Hash, config *chain.ForksInTime) StorageStatus
GetBalance(addr types.Address) *big.Int
GetCodeSize(addr types.Address) int
GetCodeHash(addr types.Address) types.Hash
GetCode(addr types.Address) []byte
Selfdestruct(addr types.Address, beneficiary types.Address)
GetTxContext() TxContext
GetBlockHash(number int64) types.Hash
EmitLog(addr types.Address, topics []types.Hash, data []byte)
Callx(*Contract, Host) *ExecutionResult
Empty(addr types.Address) bool
GetNonce(addr types.Address) uint64
GetEVMLogger() EVMLogger
}
// ExecutionResult includes all output after executing given evm
// message no matter the execution itself is successful or not.
type ExecutionResult struct {
ReturnValue []byte // Returned data from the runtime (function result or data supplied with revert opcode)
GasLeft uint64 // Total gas left as result of execution
GasUsed uint64 // Total gas used as result of execution
Err error // Any error encountered during the execution, listed below
}
func (r *ExecutionResult) Succeeded() bool { return r.Err == nil }
func (r *ExecutionResult) Failed() bool { return r.Err != nil }
func (r *ExecutionResult) Reverted() bool { return errors.Is(r.Err, ErrExecutionReverted) }
// Return is a helper function to help caller distinguish between revert reason
// and function return. Return returns the data after execution if no error occurs.
func (r *ExecutionResult) Return() []byte {
if r.Err != nil {
return nil
}
return r.ReturnValue
}
// Revert returns the concrete revert reason if the execution is aborted by `REVERT`
// opcode. Note the reason can be nil if no data supplied with revert opcode.
func (r *ExecutionResult) Revert() []byte {
if !r.Reverted() {
return nil
}
return r.ReturnValue
}
func (r *ExecutionResult) UpdateGasUsed(gasLimit uint64, refund uint64) {
r.GasUsed = gasLimit - r.GasLeft
// Refund can go up to half the gas used
if maxRefund := r.GasUsed / 2; refund > maxRefund {
refund = maxRefund
}
r.GasLeft += refund
r.GasUsed -= refund
}
var (
ErrOutOfGas = errors.New("out of gas")
ErrStackOverflow = errors.New("stack overflow")
ErrStackUnderflow = errors.New("stack underflow")
ErrNotEnoughFunds = errors.New("not enough funds")
ErrInsufficientBalance = errors.New("insufficient balance for transfer")
ErrMaxCodeSizeExceeded = errors.New("evm: max code size exceeded")
ErrContractAddressCollision = errors.New("contract address collision")
ErrDepth = errors.New("max call depth exceeded")
ErrExecutionReverted = errors.New("execution was reverted")
ErrCodeStoreOutOfGas = errors.New("contract creation code storage out of gas")
ErrCodeEmpty = errors.New("contract code empty")
ErrStorageReadFailed = errors.New("storage read failed")
)
type CallType int
const (
Call CallType = iota
CallCode
DelegateCall
StaticCall
Create
Create2
)
func IsCreateType(typ CallType) bool {
switch typ {
case Create, Create2:
return true
}
return false
}
func IsCallType(typ CallType) bool {
switch typ {
case Call, CallCode, DelegateCall, StaticCall:
return true
}
return false
}
// Runtime can process contracts
type Runtime interface {
Run(c *Contract, host Host, config *chain.ForksInTime) *ExecutionResult
CanRun(c *Contract, host Host, config *chain.ForksInTime) bool
Name() string
}
// Contract is the instance being called
type Contract struct {
Code []byte
Type CallType
CodeAddress types.Address
Address types.Address
Origin types.Address
Caller types.Address
Depth int
Value *big.Int
Input []byte
Gas uint64
Static bool
}
func NewContract(
depth int,
origin types.Address,
from types.Address,
to types.Address,
value *big.Int,
gas uint64,
code []byte,
) *Contract {
f := &Contract{
Caller: from,
Origin: origin,
CodeAddress: to,
Address: to,
Gas: gas,
Value: value,
Code: code,
Depth: depth,
}
return f
}
func NewContractCreation(
depth int,
origin types.Address,
from types.Address,
to types.Address,
value *big.Int,
gas uint64,
code []byte,
) *Contract {
c := NewContract(depth, origin, from, to, value, gas, code)
return c
}
func NewContractCall(
depth int,
origin types.Address,
from types.Address,
to types.Address,
value *big.Int,
gas uint64,
code []byte,
input []byte,
) *Contract {
c := NewContract(depth, origin, from, to, value, gas, code)
c.Input = input
return c
}