814 lines
19 KiB
Go
814 lines
19 KiB
Go
package vm
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import (
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"fmt"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/state"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/params"
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)
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// Vm implements VirtualMachine
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type Vm struct {
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env Environment
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err error
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// For logging
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debug bool
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BreakPoints []int64
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Stepping bool
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Fn string
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Recoverable bool
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// Will be called before the vm returns
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After func(*Context, error)
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}
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// New returns a new Virtual Machine
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func New(env Environment) *Vm {
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return &Vm{env: env, debug: Debug, Recoverable: true}
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}
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// Run loops and evaluates the contract's code with the given input data
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func (self *Vm) Run(context *Context, input []byte) (ret []byte, err error) {
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self.env.SetDepth(self.env.Depth() + 1)
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defer self.env.SetDepth(self.env.Depth() - 1)
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var (
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caller = context.caller
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code = context.Code
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value = context.value
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price = context.Price
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op OpCode // current opcode
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codehash = crypto.Sha3Hash(code) // codehash is used when doing jump dest caching
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mem = NewMemory() // bound memory
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stack = newstack() // local stack
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statedb = self.env.State() // current state
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// For optimisation reason we're using uint64 as the program counter.
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// It's theoretically possible to go above 2^64. The YP defines the PC to be uint256. Pratically much less so feasible.
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pc = uint64(0) // program counter
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// jump evaluates and checks whether the given jump destination is a valid one
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// if valid move the `pc` otherwise return an error.
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jump = func(from uint64, to *big.Int) error {
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if !context.jumpdests.has(codehash, code, to) {
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nop := context.GetOp(to.Uint64())
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return fmt.Errorf("invalid jump destination (%v) %v", nop, to)
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}
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pc = to.Uint64()
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return nil
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}
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newMemSize *big.Int
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cost *big.Int
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)
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// User defer pattern to check for an error and, based on the error being nil or not, use all gas and return.
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defer func() {
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if self.After != nil {
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self.After(context, err)
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}
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if err != nil {
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self.log(pc, op, context.Gas, cost, mem, stack, context, err)
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// In case of a VM exception (known exceptions) all gas consumed (panics NOT included).
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context.UseGas(context.Gas)
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ret = context.Return(nil)
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}
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}()
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if context.CodeAddr != nil {
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if p := Precompiled[context.CodeAddr.Str()]; p != nil {
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return self.RunPrecompiled(p, input, context)
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}
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}
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// Don't bother with the execution if there's no code.
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if len(code) == 0 {
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return context.Return(nil), nil
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}
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for {
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// The base for all big integer arithmetic
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base := new(big.Int)
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// Get the memory location of pc
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op = context.GetOp(pc)
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// calculate the new memory size and gas price for the current executing opcode
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newMemSize, cost, err = self.calculateGasAndSize(context, caller, op, statedb, mem, stack)
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if err != nil {
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return nil, err
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}
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// Use the calculated gas. When insufficient gas is present, use all gas and return an
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// Out Of Gas error
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if !context.UseGas(cost) {
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context.UseGas(context.Gas)
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return context.Return(nil), OutOfGasError{}
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}
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// Resize the memory calculated previously
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mem.Resize(newMemSize.Uint64())
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// Add a log message
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self.log(pc, op, context.Gas, cost, mem, stack, context, nil)
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switch op {
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case ADD:
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x, y := stack.pop(), stack.pop()
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base.Add(x, y)
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U256(base)
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// pop result back on the stack
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stack.push(base)
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case SUB:
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x, y := stack.pop(), stack.pop()
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base.Sub(x, y)
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U256(base)
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// pop result back on the stack
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stack.push(base)
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case MUL:
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x, y := stack.pop(), stack.pop()
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base.Mul(x, y)
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U256(base)
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// pop result back on the stack
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stack.push(base)
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case DIV:
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x, y := stack.pop(), stack.pop()
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if y.Cmp(common.Big0) != 0 {
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base.Div(x, y)
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}
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U256(base)
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// pop result back on the stack
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stack.push(base)
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case SDIV:
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x, y := S256(stack.pop()), S256(stack.pop())
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if y.Cmp(common.Big0) == 0 {
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base.Set(common.Big0)
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} else {
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n := new(big.Int)
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if new(big.Int).Mul(x, y).Cmp(common.Big0) < 0 {
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n.SetInt64(-1)
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} else {
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n.SetInt64(1)
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}
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base.Div(x.Abs(x), y.Abs(y)).Mul(base, n)
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U256(base)
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}
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stack.push(base)
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case MOD:
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x, y := stack.pop(), stack.pop()
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if y.Cmp(common.Big0) == 0 {
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base.Set(common.Big0)
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} else {
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base.Mod(x, y)
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}
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U256(base)
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stack.push(base)
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case SMOD:
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x, y := S256(stack.pop()), S256(stack.pop())
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if y.Cmp(common.Big0) == 0 {
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base.Set(common.Big0)
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} else {
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n := new(big.Int)
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if x.Cmp(common.Big0) < 0 {
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n.SetInt64(-1)
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} else {
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n.SetInt64(1)
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}
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base.Mod(x.Abs(x), y.Abs(y)).Mul(base, n)
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U256(base)
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}
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stack.push(base)
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case EXP:
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x, y := stack.pop(), stack.pop()
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base.Exp(x, y, Pow256)
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U256(base)
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stack.push(base)
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case SIGNEXTEND:
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back := stack.pop()
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if back.Cmp(big.NewInt(31)) < 0 {
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bit := uint(back.Uint64()*8 + 7)
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num := stack.pop()
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mask := new(big.Int).Lsh(common.Big1, bit)
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mask.Sub(mask, common.Big1)
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if common.BitTest(num, int(bit)) {
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num.Or(num, mask.Not(mask))
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} else {
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num.And(num, mask)
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}
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num = U256(num)
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stack.push(num)
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}
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case NOT:
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stack.push(U256(new(big.Int).Not(stack.pop())))
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case LT:
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x, y := stack.pop(), stack.pop()
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// x < y
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if x.Cmp(y) < 0 {
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stack.push(common.BigTrue)
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} else {
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stack.push(common.BigFalse)
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}
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case GT:
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x, y := stack.pop(), stack.pop()
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// x > y
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if x.Cmp(y) > 0 {
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stack.push(common.BigTrue)
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} else {
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stack.push(common.BigFalse)
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}
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case SLT:
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x, y := S256(stack.pop()), S256(stack.pop())
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// x < y
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if x.Cmp(S256(y)) < 0 {
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stack.push(common.BigTrue)
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} else {
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stack.push(common.BigFalse)
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}
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case SGT:
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x, y := S256(stack.pop()), S256(stack.pop())
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// x > y
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if x.Cmp(y) > 0 {
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stack.push(common.BigTrue)
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} else {
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stack.push(common.BigFalse)
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}
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case EQ:
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x, y := stack.pop(), stack.pop()
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// x == y
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if x.Cmp(y) == 0 {
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stack.push(common.BigTrue)
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} else {
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stack.push(common.BigFalse)
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}
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case ISZERO:
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x := stack.pop()
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if x.Cmp(common.BigFalse) > 0 {
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stack.push(common.BigFalse)
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} else {
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stack.push(common.BigTrue)
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}
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case AND:
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x, y := stack.pop(), stack.pop()
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stack.push(base.And(x, y))
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case OR:
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x, y := stack.pop(), stack.pop()
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stack.push(base.Or(x, y))
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case XOR:
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x, y := stack.pop(), stack.pop()
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stack.push(base.Xor(x, y))
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case BYTE:
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th, val := stack.pop(), stack.pop()
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if th.Cmp(big.NewInt(32)) < 0 {
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byt := big.NewInt(int64(common.LeftPadBytes(val.Bytes(), 32)[th.Int64()]))
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base.Set(byt)
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} else {
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base.Set(common.BigFalse)
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}
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stack.push(base)
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case ADDMOD:
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x := stack.pop()
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y := stack.pop()
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z := stack.pop()
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if z.Cmp(Zero) > 0 {
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add := new(big.Int).Add(x, y)
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base.Mod(add, z)
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base = U256(base)
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}
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stack.push(base)
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case MULMOD:
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x := stack.pop()
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y := stack.pop()
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z := stack.pop()
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if z.Cmp(Zero) > 0 {
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mul := new(big.Int).Mul(x, y)
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base.Mod(mul, z)
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U256(base)
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}
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stack.push(base)
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case SHA3:
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offset, size := stack.pop(), stack.pop()
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data := crypto.Sha3(mem.Get(offset.Int64(), size.Int64()))
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stack.push(common.BigD(data))
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case ADDRESS:
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stack.push(common.Bytes2Big(context.Address().Bytes()))
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case BALANCE:
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addr := common.BigToAddress(stack.pop())
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balance := statedb.GetBalance(addr)
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stack.push(balance)
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case ORIGIN:
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origin := self.env.Origin()
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stack.push(origin.Big())
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case CALLER:
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caller := context.caller.Address()
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stack.push(common.Bytes2Big(caller.Bytes()))
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case CALLVALUE:
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stack.push(value)
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case CALLDATALOAD:
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data := getData(input, stack.pop(), common.Big32)
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stack.push(common.Bytes2Big(data))
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case CALLDATASIZE:
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l := int64(len(input))
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stack.push(big.NewInt(l))
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case CALLDATACOPY:
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var (
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mOff = stack.pop()
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cOff = stack.pop()
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l = stack.pop()
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)
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data := getData(input, cOff, l)
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mem.Set(mOff.Uint64(), l.Uint64(), data)
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case CODESIZE, EXTCODESIZE:
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var code []byte
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if op == EXTCODESIZE {
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addr := common.BigToAddress(stack.pop())
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code = statedb.GetCode(addr)
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} else {
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code = context.Code
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}
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l := big.NewInt(int64(len(code)))
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stack.push(l)
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case CODECOPY, EXTCODECOPY:
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var code []byte
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if op == EXTCODECOPY {
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addr := common.BigToAddress(stack.pop())
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code = statedb.GetCode(addr)
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} else {
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code = context.Code
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}
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var (
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mOff = stack.pop()
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cOff = stack.pop()
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l = stack.pop()
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)
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codeCopy := getData(code, cOff, l)
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mem.Set(mOff.Uint64(), l.Uint64(), codeCopy)
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case GASPRICE:
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stack.push(context.Price)
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case BLOCKHASH:
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num := stack.pop()
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n := new(big.Int).Sub(self.env.BlockNumber(), common.Big257)
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if num.Cmp(n) > 0 && num.Cmp(self.env.BlockNumber()) < 0 {
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stack.push(self.env.GetHash(num.Uint64()).Big())
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} else {
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stack.push(common.Big0)
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}
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case COINBASE:
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coinbase := self.env.Coinbase()
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stack.push(coinbase.Big())
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case TIMESTAMP:
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time := self.env.Time()
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stack.push(big.NewInt(time))
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case NUMBER:
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number := self.env.BlockNumber()
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stack.push(U256(number))
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case DIFFICULTY:
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difficulty := self.env.Difficulty()
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stack.push(difficulty)
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case GASLIMIT:
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stack.push(self.env.GasLimit())
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case PUSH1, 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:
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size := uint64(op - PUSH1 + 1)
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byts := getData(code, new(big.Int).SetUint64(pc+1), new(big.Int).SetUint64(size))
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// push value to stack
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stack.push(common.Bytes2Big(byts))
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pc += size
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case POP:
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stack.pop()
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case DUP1, DUP2, DUP3, DUP4, DUP5, DUP6, DUP7, DUP8, DUP9, DUP10, DUP11, DUP12, DUP13, DUP14, DUP15, DUP16:
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n := int(op - DUP1 + 1)
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stack.dup(n)
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case SWAP1, SWAP2, SWAP3, SWAP4, SWAP5, SWAP6, SWAP7, SWAP8, SWAP9, SWAP10, SWAP11, SWAP12, SWAP13, SWAP14, SWAP15, SWAP16:
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n := int(op - SWAP1 + 2)
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stack.swap(n)
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case LOG0, LOG1, LOG2, LOG3, LOG4:
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n := int(op - LOG0)
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topics := make([]common.Hash, n)
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mStart, mSize := stack.pop(), stack.pop()
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for i := 0; i < n; i++ {
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topics[i] = common.BigToHash(stack.pop())
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}
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data := mem.Get(mStart.Int64(), mSize.Int64())
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log := state.NewLog(context.Address(), topics, data, self.env.BlockNumber().Uint64())
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self.env.AddLog(log)
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case MLOAD:
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offset := stack.pop()
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val := common.BigD(mem.Get(offset.Int64(), 32))
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stack.push(val)
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case MSTORE:
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// pop value of the stack
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mStart, val := stack.pop(), stack.pop()
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mem.Set(mStart.Uint64(), 32, common.BigToBytes(val, 256))
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case MSTORE8:
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off, val := stack.pop().Int64(), stack.pop().Int64()
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mem.store[off] = byte(val & 0xff)
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case SLOAD:
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loc := common.BigToHash(stack.pop())
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val := common.Bytes2Big(statedb.GetState(context.Address(), loc))
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stack.push(val)
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case SSTORE:
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loc := common.BigToHash(stack.pop())
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val := stack.pop()
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statedb.SetState(context.Address(), loc, val)
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case JUMP:
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if err := jump(pc, stack.pop()); err != nil {
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return nil, err
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}
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continue
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case JUMPI:
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pos, cond := stack.pop(), stack.pop()
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if cond.Cmp(common.BigTrue) >= 0 {
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if err := jump(pc, pos); err != nil {
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return nil, err
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}
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continue
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}
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case JUMPDEST:
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case PC:
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stack.push(new(big.Int).SetUint64(pc))
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case MSIZE:
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stack.push(big.NewInt(int64(mem.Len())))
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case GAS:
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stack.push(context.Gas)
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case CREATE:
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var (
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value = stack.pop()
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offset, size = stack.pop(), stack.pop()
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input = mem.Get(offset.Int64(), size.Int64())
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gas = new(big.Int).Set(context.Gas)
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addr common.Address
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)
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context.UseGas(context.Gas)
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ret, suberr, ref := self.env.Create(context, input, gas, price, value)
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if suberr != nil {
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stack.push(common.BigFalse)
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} else {
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// gas < len(ret) * CreateDataGas == NO_CODE
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dataGas := big.NewInt(int64(len(ret)))
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dataGas.Mul(dataGas, params.CreateDataGas)
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if context.UseGas(dataGas) {
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ref.SetCode(ret)
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}
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addr = ref.Address()
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|
stack.push(addr.Big())
|
|
|
|
}
|
|
|
|
case CALL, CALLCODE:
|
|
gas := stack.pop()
|
|
// pop gas and value of the stack.
|
|
addr, value := stack.pop(), stack.pop()
|
|
value = U256(value)
|
|
// pop input size and offset
|
|
inOffset, inSize := stack.pop(), stack.pop()
|
|
// pop return size and offset
|
|
retOffset, retSize := stack.pop(), stack.pop()
|
|
|
|
address := common.BigToAddress(addr)
|
|
|
|
// Get the arguments from the memory
|
|
args := mem.Get(inOffset.Int64(), inSize.Int64())
|
|
|
|
if len(value.Bytes()) > 0 {
|
|
gas.Add(gas, params.CallStipend)
|
|
}
|
|
|
|
var (
|
|
ret []byte
|
|
err error
|
|
)
|
|
if op == CALLCODE {
|
|
ret, err = self.env.CallCode(context, address, args, gas, price, value)
|
|
} else {
|
|
ret, err = self.env.Call(context, address, args, gas, price, value)
|
|
}
|
|
|
|
if err != nil {
|
|
stack.push(common.BigFalse)
|
|
|
|
} else {
|
|
stack.push(common.BigTrue)
|
|
|
|
mem.Set(retOffset.Uint64(), retSize.Uint64(), ret)
|
|
}
|
|
|
|
case RETURN:
|
|
offset, size := stack.pop(), stack.pop()
|
|
ret := mem.GetPtr(offset.Int64(), size.Int64())
|
|
|
|
return context.Return(ret), nil
|
|
case SUICIDE:
|
|
receiver := statedb.GetOrNewStateObject(common.BigToAddress(stack.pop()))
|
|
balance := statedb.GetBalance(context.Address())
|
|
|
|
receiver.AddBalance(balance)
|
|
|
|
statedb.Delete(context.Address())
|
|
|
|
fallthrough
|
|
case STOP: // Stop the context
|
|
|
|
return context.Return(nil), nil
|
|
default:
|
|
|
|
return nil, fmt.Errorf("Invalid opcode %x", op)
|
|
}
|
|
|
|
pc++
|
|
|
|
}
|
|
}
|
|
|
|
// calculateGasAndSize calculates the required given the opcode and stack items calculates the new memorysize for
|
|
// the operation. This does not reduce gas or resizes the memory.
|
|
func (self *Vm) calculateGasAndSize(context *Context, caller ContextRef, op OpCode, statedb *state.StateDB, mem *Memory, stack *stack) (*big.Int, *big.Int, error) {
|
|
var (
|
|
gas = new(big.Int)
|
|
newMemSize *big.Int = new(big.Int)
|
|
)
|
|
err := baseCheck(op, stack, gas)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
// stack Check, memory resize & gas phase
|
|
switch op {
|
|
case SWAP1, SWAP2, SWAP3, SWAP4, SWAP5, SWAP6, SWAP7, SWAP8, SWAP9, SWAP10, SWAP11, SWAP12, SWAP13, SWAP14, SWAP15, SWAP16:
|
|
n := int(op - SWAP1 + 2)
|
|
err := stack.require(n)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
gas.Set(GasFastestStep)
|
|
case DUP1, DUP2, DUP3, DUP4, DUP5, DUP6, DUP7, DUP8, DUP9, DUP10, DUP11, DUP12, DUP13, DUP14, DUP15, DUP16:
|
|
n := int(op - DUP1 + 1)
|
|
err := stack.require(n)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
gas.Set(GasFastestStep)
|
|
case LOG0, LOG1, LOG2, LOG3, LOG4:
|
|
n := int(op - LOG0)
|
|
err := stack.require(n + 2)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
mSize, mStart := stack.data[stack.len()-2], stack.data[stack.len()-1]
|
|
|
|
gas.Add(gas, params.LogGas)
|
|
gas.Add(gas, new(big.Int).Mul(big.NewInt(int64(n)), params.LogTopicGas))
|
|
gas.Add(gas, new(big.Int).Mul(mSize, params.LogDataGas))
|
|
|
|
newMemSize = calcMemSize(mStart, mSize)
|
|
case EXP:
|
|
gas.Add(gas, new(big.Int).Mul(big.NewInt(int64(len(stack.data[stack.len()-2].Bytes()))), params.ExpByteGas))
|
|
case SSTORE:
|
|
err := stack.require(2)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
var g *big.Int
|
|
y, x := stack.data[stack.len()-2], stack.data[stack.len()-1]
|
|
val := statedb.GetState(context.Address(), common.BigToHash(x))
|
|
if len(val) == 0 && len(y.Bytes()) > 0 {
|
|
// 0 => non 0
|
|
g = params.SstoreSetGas
|
|
} else if len(val) > 0 && len(y.Bytes()) == 0 {
|
|
statedb.Refund(self.env.Origin(), params.SstoreRefundGas)
|
|
|
|
g = params.SstoreClearGas
|
|
} else {
|
|
// non 0 => non 0 (or 0 => 0)
|
|
g = params.SstoreClearGas
|
|
}
|
|
gas.Set(g)
|
|
case SUICIDE:
|
|
if !statedb.IsDeleted(context.Address()) {
|
|
statedb.Refund(self.env.Origin(), params.SuicideRefundGas)
|
|
}
|
|
case MLOAD:
|
|
newMemSize = calcMemSize(stack.peek(), u256(32))
|
|
case MSTORE8:
|
|
newMemSize = calcMemSize(stack.peek(), u256(1))
|
|
case MSTORE:
|
|
newMemSize = calcMemSize(stack.peek(), u256(32))
|
|
case RETURN:
|
|
newMemSize = calcMemSize(stack.peek(), stack.data[stack.len()-2])
|
|
case SHA3:
|
|
newMemSize = calcMemSize(stack.peek(), stack.data[stack.len()-2])
|
|
|
|
words := toWordSize(stack.data[stack.len()-2])
|
|
gas.Add(gas, words.Mul(words, params.Sha3WordGas))
|
|
case CALLDATACOPY:
|
|
newMemSize = calcMemSize(stack.peek(), stack.data[stack.len()-3])
|
|
|
|
words := toWordSize(stack.data[stack.len()-3])
|
|
gas.Add(gas, words.Mul(words, params.CopyGas))
|
|
case CODECOPY:
|
|
newMemSize = calcMemSize(stack.peek(), stack.data[stack.len()-3])
|
|
|
|
words := toWordSize(stack.data[stack.len()-3])
|
|
gas.Add(gas, words.Mul(words, params.CopyGas))
|
|
case EXTCODECOPY:
|
|
newMemSize = calcMemSize(stack.data[stack.len()-2], stack.data[stack.len()-4])
|
|
|
|
words := toWordSize(stack.data[stack.len()-4])
|
|
gas.Add(gas, words.Mul(words, params.CopyGas))
|
|
|
|
case CREATE:
|
|
newMemSize = calcMemSize(stack.data[stack.len()-2], stack.data[stack.len()-3])
|
|
case CALL, CALLCODE:
|
|
gas.Add(gas, stack.data[stack.len()-1])
|
|
|
|
if op == CALL {
|
|
if self.env.State().GetStateObject(common.BigToAddress(stack.data[stack.len()-2])) == nil {
|
|
gas.Add(gas, params.CallNewAccountGas)
|
|
}
|
|
}
|
|
|
|
if len(stack.data[stack.len()-3].Bytes()) > 0 {
|
|
gas.Add(gas, params.CallValueTransferGas)
|
|
}
|
|
|
|
x := calcMemSize(stack.data[stack.len()-6], stack.data[stack.len()-7])
|
|
y := calcMemSize(stack.data[stack.len()-4], stack.data[stack.len()-5])
|
|
|
|
newMemSize = common.BigMax(x, y)
|
|
}
|
|
|
|
if newMemSize.Cmp(common.Big0) > 0 {
|
|
newMemSizeWords := toWordSize(newMemSize)
|
|
newMemSize.Mul(newMemSizeWords, u256(32))
|
|
|
|
if newMemSize.Cmp(u256(int64(mem.Len()))) > 0 {
|
|
oldSize := toWordSize(big.NewInt(int64(mem.Len())))
|
|
pow := new(big.Int).Exp(oldSize, common.Big2, Zero)
|
|
linCoef := new(big.Int).Mul(oldSize, params.MemoryGas)
|
|
quadCoef := new(big.Int).Div(pow, params.QuadCoeffDiv)
|
|
oldTotalFee := new(big.Int).Add(linCoef, quadCoef)
|
|
|
|
pow.Exp(newMemSizeWords, common.Big2, Zero)
|
|
linCoef = new(big.Int).Mul(newMemSizeWords, params.MemoryGas)
|
|
quadCoef = new(big.Int).Div(pow, params.QuadCoeffDiv)
|
|
newTotalFee := new(big.Int).Add(linCoef, quadCoef)
|
|
|
|
fee := new(big.Int).Sub(newTotalFee, oldTotalFee)
|
|
gas.Add(gas, fee)
|
|
}
|
|
}
|
|
|
|
return newMemSize, gas, nil
|
|
}
|
|
|
|
// RunPrecompile runs and evaluate the output of a precompiled contract defined in contracts.go
|
|
func (self *Vm) RunPrecompiled(p *PrecompiledAccount, input []byte, context *Context) (ret []byte, err error) {
|
|
gas := p.Gas(len(input))
|
|
if context.UseGas(gas) {
|
|
ret = p.Call(input)
|
|
|
|
return context.Return(ret), nil
|
|
} else {
|
|
return nil, OutOfGasError{}
|
|
}
|
|
}
|
|
|
|
// log emits a log event to the environment for each opcode encountered. This is not to be confused with the
|
|
// LOG* opcode.
|
|
func (self *Vm) log(pc uint64, op OpCode, gas, cost *big.Int, memory *Memory, stack *stack, context *Context, err error) {
|
|
if Debug {
|
|
mem := make([]byte, len(memory.Data()))
|
|
copy(mem, memory.Data())
|
|
stck := make([]*big.Int, len(stack.Data()))
|
|
copy(stck, stack.Data())
|
|
|
|
object := context.self.(*state.StateObject)
|
|
storage := make(map[common.Hash][]byte)
|
|
object.EachStorage(func(k, v []byte) {
|
|
storage[common.BytesToHash(k)] = v
|
|
})
|
|
|
|
self.env.AddStructLog(StructLog{pc, op, new(big.Int).Set(gas), cost, mem, stck, storage, err})
|
|
}
|
|
}
|
|
|
|
// Environment returns the current workable state of the VM
|
|
func (self *Vm) Env() Environment {
|
|
return self.env
|
|
}
|