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core, all: split vm.Context into BlockContext and TxContext (#21672)

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* all: core: split vm.Config into BlockConfig and TxConfig

* core: core/vm: reset EVM between tx in block instead of creating new

* core/vm: added docs
This commit is contained in:
Marius van der Wijden
2020-11-13 13:42:19 +01:00
committed by GitHub
parent 6f4cccf8d2
commit 2045a2bba3
24 changed files with 183 additions and 139 deletions
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41
core/vm/evm.go
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@ -91,9 +91,9 @@ func run(evm *EVM, contract *Contract, input []byte, readOnly bool) ([]byte, err
return nil, errors.New("no compatible interpreter")
}
// Context provides the EVM with auxiliary information. Once provided
// BlockContext provides the EVM with auxiliary information. Once provided
// it shouldn't be modified.
type Context struct {
type BlockContext struct {
// CanTransfer returns whether the account contains
// sufficient ether to transfer the value
CanTransfer CanTransferFunc
@ -102,10 +102,6 @@ type Context struct {
// GetHash returns the hash corresponding to n
GetHash GetHashFunc
// Message information
Origin common.Address // Provides information for ORIGIN
GasPrice *big.Int // Provides information for GASPRICE
// Block information
Coinbase common.Address // Provides information for COINBASE
GasLimit uint64 // Provides information for GASLIMIT
@ -114,6 +110,14 @@ type Context struct {
Difficulty *big.Int // Provides information for DIFFICULTY
}
// TxContext provides the EVM with information about a transaction.
// All fields can change between transactions.
type TxContext struct {
// Message information
Origin common.Address // Provides information for ORIGIN
GasPrice *big.Int // Provides information for GASPRICE
}
// EVM is the Ethereum Virtual Machine base object and provides
// the necessary tools to run a contract on the given state with
// the provided context. It should be noted that any error
@ -125,7 +129,8 @@ type Context struct {
// The EVM should never be reused and is not thread safe.
type EVM struct {
// Context provides auxiliary blockchain related information
Context
Context BlockContext
TxContext
// StateDB gives access to the underlying state
StateDB StateDB
// Depth is the current call stack
@ -153,17 +158,18 @@ type EVM struct {
// NewEVM returns a new EVM. The returned EVM is not thread safe and should
// only ever be used *once*.
func NewEVM(ctx Context, statedb StateDB, chainConfig *params.ChainConfig, vmConfig Config) *EVM {
func NewEVM(blockCtx BlockContext, txCtx TxContext, statedb StateDB, chainConfig *params.ChainConfig, vmConfig Config) *EVM {
evm := &EVM{
Context: ctx,
Context: blockCtx,
TxContext: txCtx,
StateDB: statedb,
vmConfig: vmConfig,
chainConfig: chainConfig,
chainRules: chainConfig.Rules(ctx.BlockNumber),
chainRules: chainConfig.Rules(blockCtx.BlockNumber),
interpreters: make([]Interpreter, 0, 1),
}
if chainConfig.IsEWASM(ctx.BlockNumber) {
if chainConfig.IsEWASM(blockCtx.BlockNumber) {
// to be implemented by EVM-C and Wagon PRs.
// if vmConfig.EWASMInterpreter != "" {
// extIntOpts := strings.Split(vmConfig.EWASMInterpreter, ":")
@ -187,6 +193,13 @@ func NewEVM(ctx Context, statedb StateDB, chainConfig *params.ChainConfig, vmCon
return evm
}
// Reset resets the EVM with a new transaction context.Reset
// This is not threadsafe and should only be done very cautiously.
func (evm *EVM) Reset(txCtx TxContext, statedb StateDB) {
evm.TxContext = txCtx
evm.StateDB = statedb
}
// Cancel cancels any running EVM operation. This may be called concurrently and
// it's safe to be called multiple times.
func (evm *EVM) Cancel() {
@ -233,7 +246,7 @@ func (evm *EVM) Call(caller ContractRef, addr common.Address, input []byte, gas
}
evm.StateDB.CreateAccount(addr)
}
evm.Transfer(evm.StateDB, caller.Address(), addr, value)
evm.Context.Transfer(evm.StateDB, caller.Address(), addr, value)
// Capture the tracer start/end events in debug mode
if evm.vmConfig.Debug && evm.depth == 0 {
@ -426,7 +439,7 @@ func (evm *EVM) create(caller ContractRef, codeAndHash *codeAndHash, gas uint64,
if evm.depth > int(params.CallCreateDepth) {
return nil, common.Address{}, gas, ErrDepth
}
if !evm.CanTransfer(evm.StateDB, caller.Address(), value) {
if !evm.Context.CanTransfer(evm.StateDB, caller.Address(), value) {
return nil, common.Address{}, gas, ErrInsufficientBalance
}
nonce := evm.StateDB.GetNonce(caller.Address())
@ -447,7 +460,7 @@ func (evm *EVM) create(caller ContractRef, codeAndHash *codeAndHash, gas uint64,
if evm.chainRules.IsEIP158 {
evm.StateDB.SetNonce(address, 1)
}
evm.Transfer(evm.StateDB, caller.Address(), address, value)
evm.Context.Transfer(evm.StateDB, caller.Address(), address, value)
// Initialise a new contract and set the code that is to be used by the EVM.
// The contract is a scoped environment for this execution context only.