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-rw-r--r--core/vm/environment.go171
1 files changed, 92 insertions, 79 deletions
diff --git a/core/vm/environment.go b/core/vm/environment.go
index 50a09d444..b74b3a795 100644
--- a/core/vm/environment.go
+++ b/core/vm/environment.go
@@ -19,6 +19,7 @@ package vm
import (
"fmt"
"math/big"
+ "sync/atomic"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
@@ -55,41 +56,54 @@ type Context struct {
Difficulty *big.Int // Provides information for DIFFICULTY
}
-// Environment provides information about external sources for the EVM
+// EVM provides information about external sources for the EVM
//
-// The Environment should never be reused and is not thread safe.
-type Environment struct {
+// The EVM should never be reused and is not thread safe.
+type EVM struct {
// Context provides auxiliary blockchain related information
Context
// StateDB gives access to the underlying state
StateDB StateDB
// Depth is the current call stack
- Depth int
+ depth int
- // evm is the ethereum virtual machine
- evm Vm
// chainConfig contains information about the current chain
chainConfig *params.ChainConfig
- vmConfig Config
+ // virtual machine configuration options used to initialise the
+ // evm.
+ vmConfig Config
+ // global (to this context) ethereum virtual machine
+ // used throughout the execution of the tx.
+ interpreter *Interpreter
+ // abort is used to abort the EVM calling operations
+ // NOTE: must be set atomically
+ abort int32
}
-// NewEnvironment retutrns a new EVM environment.
-func NewEnvironment(context Context, statedb StateDB, chainConfig *params.ChainConfig, vmConfig Config) *Environment {
- env := &Environment{
- Context: context,
+// NewEVM retutrns a new EVM evmironment.
+func NewEVM(ctx Context, statedb StateDB, chainConfig *params.ChainConfig, vmConfig Config) *EVM {
+ evm := &EVM{
+ Context: ctx,
StateDB: statedb,
vmConfig: vmConfig,
chainConfig: chainConfig,
}
- env.evm = New(env, vmConfig)
- return env
+
+ evm.interpreter = NewInterpreter(evm, vmConfig)
+ return evm
+}
+
+// Cancel cancels any running EVM operation. This may be called concurrently and it's safe to be
+// called multiple times.
+func (evm *EVM) Cancel() {
+ atomic.StoreInt32(&evm.abort, 1)
}
// Call executes the contract associated with the addr with the given input as paramaters. It also handles any
// necessary value transfer required and takes the necessary steps to create accounts and reverses the state in
// case of an execution error or failed value transfer.
-func (env *Environment) Call(caller ContractRef, addr common.Address, input []byte, gas, value *big.Int) ([]byte, error) {
- if env.vmConfig.NoRecursion && env.Depth > 0 {
+func (evm *EVM) Call(caller ContractRef, addr common.Address, input []byte, gas, value *big.Int) (ret []byte, err error) {
+ if evm.vmConfig.NoRecursion && evm.depth > 0 {
caller.ReturnGas(gas)
return nil, nil
@@ -97,48 +111,48 @@ func (env *Environment) Call(caller ContractRef, addr common.Address, input []by
// Depth check execution. Fail if we're trying to execute above the
// limit.
- if env.Depth > int(params.CallCreateDepth.Int64()) {
+ if evm.depth > int(params.CallCreateDepth.Int64()) {
caller.ReturnGas(gas)
- return nil, DepthError
+ return nil, ErrDepth
}
- if !env.Context.CanTransfer(env.StateDB, caller.Address(), value) {
+ if !evm.Context.CanTransfer(evm.StateDB, caller.Address(), value) {
caller.ReturnGas(gas)
return nil, ErrInsufficientBalance
}
var (
- to Account
- snapshotPreTransfer = env.StateDB.Snapshot()
+ to Account
+ snapshot = evm.StateDB.Snapshot()
)
- if !env.StateDB.Exist(addr) {
- if Precompiled[addr.Str()] == nil && env.ChainConfig().IsEIP158(env.BlockNumber) && value.BitLen() == 0 {
+ if !evm.StateDB.Exist(addr) {
+ if PrecompiledContracts[addr] == nil && evm.ChainConfig().IsEIP158(evm.BlockNumber) && value.BitLen() == 0 {
caller.ReturnGas(gas)
return nil, nil
}
- to = env.StateDB.CreateAccount(addr)
+ to = evm.StateDB.CreateAccount(addr)
} else {
- to = env.StateDB.GetAccount(addr)
+ to = evm.StateDB.GetAccount(addr)
}
- env.Transfer(env.StateDB, caller.Address(), to.Address(), value)
+ evm.Transfer(evm.StateDB, caller.Address(), to.Address(), value)
// initialise a new contract and set the code that is to be used by the
- // E The contract is a scoped environment for this execution context
+ // E The contract is a scoped evmironment for this execution context
// only.
contract := NewContract(caller, to, value, gas)
- contract.SetCallCode(&addr, env.StateDB.GetCodeHash(addr), env.StateDB.GetCode(addr))
+ contract.SetCallCode(&addr, evm.StateDB.GetCodeHash(addr), evm.StateDB.GetCode(addr))
defer contract.Finalise()
- ret, err := env.EVM().Run(contract, input)
+ ret, err = evm.interpreter.Run(contract, input)
// When an error was returned by the EVM or when setting the creation code
// above we revert to the snapshot and consume any gas remaining. Additionally
// when we're in homestead this also counts for code storage gas errors.
if err != nil {
contract.UseGas(contract.Gas)
- env.StateDB.RevertToSnapshot(snapshotPreTransfer)
+ evm.StateDB.RevertToSnapshot(snapshot)
}
return ret, err
}
@@ -148,8 +162,8 @@ func (env *Environment) Call(caller ContractRef, addr common.Address, input []by
// case of an execution error or failed value transfer.
//
// CallCode differs from Call in the sense that it executes the given address' code with the caller as context.
-func (env *Environment) CallCode(caller ContractRef, addr common.Address, input []byte, gas, value *big.Int) ([]byte, error) {
- if env.vmConfig.NoRecursion && env.Depth > 0 {
+func (evm *EVM) CallCode(caller ContractRef, addr common.Address, input []byte, gas, value *big.Int) (ret []byte, err error) {
+ if evm.vmConfig.NoRecursion && evm.depth > 0 {
caller.ReturnGas(gas)
return nil, nil
@@ -157,33 +171,33 @@ func (env *Environment) CallCode(caller ContractRef, addr common.Address, input
// Depth check execution. Fail if we're trying to execute above the
// limit.
- if env.Depth > int(params.CallCreateDepth.Int64()) {
+ if evm.depth > int(params.CallCreateDepth.Int64()) {
caller.ReturnGas(gas)
- return nil, DepthError
+ return nil, ErrDepth
}
- if !env.CanTransfer(env.StateDB, caller.Address(), value) {
+ if !evm.CanTransfer(evm.StateDB, caller.Address(), value) {
caller.ReturnGas(gas)
- return nil, fmt.Errorf("insufficient funds to transfer value. Req %v, has %v", value, env.StateDB.GetBalance(caller.Address()))
+ return nil, fmt.Errorf("insufficient funds to transfer value. Req %v, has %v", value, evm.StateDB.GetBalance(caller.Address()))
}
var (
- snapshotPreTransfer = env.StateDB.Snapshot()
- to = env.StateDB.GetAccount(caller.Address())
+ snapshot = evm.StateDB.Snapshot()
+ to = evm.StateDB.GetAccount(caller.Address())
)
// initialise a new contract and set the code that is to be used by the
- // E The contract is a scoped environment for this execution context
+ // E The contract is a scoped evmironment for this execution context
// only.
contract := NewContract(caller, to, value, gas)
- contract.SetCallCode(&addr, env.StateDB.GetCodeHash(addr), env.StateDB.GetCode(addr))
+ contract.SetCallCode(&addr, evm.StateDB.GetCodeHash(addr), evm.StateDB.GetCode(addr))
defer contract.Finalise()
- ret, err := env.EVM().Run(contract, input)
+ ret, err = evm.interpreter.Run(contract, input)
if err != nil {
contract.UseGas(contract.Gas)
- env.StateDB.RevertToSnapshot(snapshotPreTransfer)
+ evm.StateDB.RevertToSnapshot(snapshot)
}
return ret, err
@@ -194,8 +208,8 @@ func (env *Environment) CallCode(caller ContractRef, addr common.Address, input
//
// DelegateCall differs from CallCode in the sense that it executes the given address' code with the caller as context
// and the caller is set to the caller of the caller.
-func (env *Environment) DelegateCall(caller ContractRef, addr common.Address, input []byte, gas *big.Int) ([]byte, error) {
- if env.vmConfig.NoRecursion && env.Depth > 0 {
+func (evm *EVM) DelegateCall(caller ContractRef, addr common.Address, input []byte, gas *big.Int) (ret []byte, err error) {
+ if evm.vmConfig.NoRecursion && evm.depth > 0 {
caller.ReturnGas(gas)
return nil, nil
@@ -203,34 +217,34 @@ func (env *Environment) DelegateCall(caller ContractRef, addr common.Address, in
// Depth check execution. Fail if we're trying to execute above the
// limit.
- if env.Depth > int(params.CallCreateDepth.Int64()) {
+ if evm.depth > int(params.CallCreateDepth.Int64()) {
caller.ReturnGas(gas)
- return nil, DepthError
+ return nil, ErrDepth
}
var (
- snapshot = env.StateDB.Snapshot()
- to = env.StateDB.GetAccount(caller.Address())
+ snapshot = evm.StateDB.Snapshot()
+ to = evm.StateDB.GetAccount(caller.Address())
)
// Iinitialise a new contract and make initialise the delegate values
contract := NewContract(caller, to, caller.Value(), gas).AsDelegate()
- contract.SetCallCode(&addr, env.StateDB.GetCodeHash(addr), env.StateDB.GetCode(addr))
+ contract.SetCallCode(&addr, evm.StateDB.GetCodeHash(addr), evm.StateDB.GetCode(addr))
defer contract.Finalise()
- ret, err := env.EVM().Run(contract, input)
+ ret, err = evm.interpreter.Run(contract, input)
if err != nil {
contract.UseGas(contract.Gas)
- env.StateDB.RevertToSnapshot(snapshot)
+ evm.StateDB.RevertToSnapshot(snapshot)
}
return ret, err
}
// Create creates a new contract using code as deployment code.
-func (env *Environment) Create(caller ContractRef, code []byte, gas, value *big.Int) ([]byte, common.Address, error) {
- if env.vmConfig.NoRecursion && env.Depth > 0 {
+func (evm *EVM) Create(caller ContractRef, code []byte, gas, value *big.Int) (ret []byte, contractAddr common.Address, err error) {
+ if evm.vmConfig.NoRecursion && evm.depth > 0 {
caller.ReturnGas(gas)
return nil, common.Address{}, nil
@@ -238,39 +252,38 @@ func (env *Environment) Create(caller ContractRef, code []byte, gas, value *big.
// Depth check execution. Fail if we're trying to execute above the
// limit.
- if env.Depth > int(params.CallCreateDepth.Int64()) {
+ if evm.depth > int(params.CallCreateDepth.Int64()) {
caller.ReturnGas(gas)
- return nil, common.Address{}, DepthError
+ return nil, common.Address{}, ErrDepth
}
- if !env.CanTransfer(env.StateDB, caller.Address(), value) {
+ if !evm.CanTransfer(evm.StateDB, caller.Address(), value) {
caller.ReturnGas(gas)
return nil, common.Address{}, ErrInsufficientBalance
}
// Create a new account on the state
- nonce := env.StateDB.GetNonce(caller.Address())
- env.StateDB.SetNonce(caller.Address(), nonce+1)
-
- snapshotPreTransfer := env.StateDB.Snapshot()
- var (
- addr = crypto.CreateAddress(caller.Address(), nonce)
- to = env.StateDB.CreateAccount(addr)
- )
- if env.ChainConfig().IsEIP158(env.BlockNumber) {
- env.StateDB.SetNonce(addr, 1)
+ nonce := evm.StateDB.GetNonce(caller.Address())
+ evm.StateDB.SetNonce(caller.Address(), nonce+1)
+
+ snapshot := evm.StateDB.Snapshot()
+ contractAddr = crypto.CreateAddress(caller.Address(), nonce)
+ to := evm.StateDB.CreateAccount(contractAddr)
+ if evm.ChainConfig().IsEIP158(evm.BlockNumber) {
+ evm.StateDB.SetNonce(contractAddr, 1)
}
- env.Transfer(env.StateDB, caller.Address(), to.Address(), value)
+ evm.Transfer(evm.StateDB, caller.Address(), to.Address(), value)
// initialise a new contract and set the code that is to be used by the
- // E The contract is a scoped environment for this execution context
+ // E The contract is a scoped evmironment for this execution context
// only.
contract := NewContract(caller, to, value, gas)
- contract.SetCallCode(&addr, crypto.Keccak256Hash(code), code)
+ contract.SetCallCode(&contractAddr, crypto.Keccak256Hash(code), code)
defer contract.Finalise()
- ret, err := env.EVM().Run(contract, nil)
+ ret, err = evm.interpreter.Run(contract, nil)
+
// check whether the max code size has been exceeded
maxCodeSizeExceeded := len(ret) > params.MaxCodeSize
// if the contract creation ran successfully and no errors were returned
@@ -281,9 +294,9 @@ func (env *Environment) Create(caller ContractRef, code []byte, gas, value *big.
dataGas := big.NewInt(int64(len(ret)))
dataGas.Mul(dataGas, params.CreateDataGas)
if contract.UseGas(dataGas) {
- env.StateDB.SetCode(addr, ret)
+ evm.StateDB.SetCode(contractAddr, ret)
} else {
- err = CodeStoreOutOfGasError
+ err = ErrCodeStoreOutOfGas
}
}
@@ -291,12 +304,12 @@ func (env *Environment) Create(caller ContractRef, code []byte, gas, value *big.
// above we revert to the snapshot and consume any gas remaining. Additionally
// when we're in homestead this also counts for code storage gas errors.
if maxCodeSizeExceeded ||
- (err != nil && (env.ChainConfig().IsHomestead(env.BlockNumber) || err != CodeStoreOutOfGasError)) {
+ (err != nil && (evm.ChainConfig().IsHomestead(evm.BlockNumber) || err != ErrCodeStoreOutOfGas)) {
contract.UseGas(contract.Gas)
- env.StateDB.RevertToSnapshot(snapshotPreTransfer)
+ evm.StateDB.RevertToSnapshot(snapshot)
// Nothing should be returned when an error is thrown.
- return nil, addr, err
+ return nil, contractAddr, err
}
// If the vm returned with an error the return value should be set to nil.
// This isn't consensus critical but merely to for behaviour reasons such as
@@ -305,11 +318,11 @@ func (env *Environment) Create(caller ContractRef, code []byte, gas, value *big.
ret = nil
}
- return ret, addr, err
+ return ret, contractAddr, err
}
-// ChainConfig returns the environment's chain configuration
-func (env *Environment) ChainConfig() *params.ChainConfig { return env.chainConfig }
+// ChainConfig returns the evmironment's chain configuration
+func (evm *EVM) ChainConfig() *params.ChainConfig { return evm.chainConfig }
-// EVM returns the environments EVM
-func (env *Environment) EVM() Vm { return env.evm }
+// Interpreter returns the EVM interpreter
+func (evm *EVM) Interpreter() *Interpreter { return evm.interpreter }
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-23 08:51:17 +0800