184e9ae9a8
Reduced the amount of state copied that are required by N calls by doing a balance check prior to any state modifications.
125 lines
4.0 KiB
Go
125 lines
4.0 KiB
Go
// Copyright 2014 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package core
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import (
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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/core/vm"
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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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// Execution is the execution environment for the given call or create action.
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type Execution struct {
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env vm.Environment
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address *common.Address
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input []byte
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evm vm.VirtualMachine
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Gas, price, value *big.Int
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}
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// NewExecution returns a new execution environment that handles all calling
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// and creation logic defined by the YP.
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func NewExecution(env vm.Environment, address *common.Address, input []byte, gas, gasPrice, value *big.Int) *Execution {
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exe := &Execution{env: env, address: address, input: input, Gas: gas, price: gasPrice, value: value}
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exe.evm = vm.NewVm(env)
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return exe
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}
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// Call executes within the given context
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func (self *Execution) Call(codeAddr common.Address, caller vm.ContextRef) ([]byte, error) {
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// Retrieve the executing code
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code := self.env.State().GetCode(codeAddr)
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return self.exec(&codeAddr, code, caller)
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}
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// Create creates a new contract and runs the initialisation procedure of the
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// contract. This returns the returned code for the contract and is stored
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// elsewhere.
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func (self *Execution) Create(caller vm.ContextRef) (ret []byte, err error, account *state.StateObject) {
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// Input must be nil for create
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code := self.input
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self.input = nil
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ret, err = self.exec(nil, code, caller)
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// Here we get an error if we run into maximum stack depth,
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// See: https://github.com/ethereum/yellowpaper/pull/131
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// and YP definitions for CREATE instruction
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if err != nil {
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return nil, err, nil
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}
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account = self.env.State().GetStateObject(*self.address)
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return
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}
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// exec executes the given code and executes within the contextAddr context.
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func (self *Execution) exec(contextAddr *common.Address, code []byte, caller vm.ContextRef) (ret []byte, err error) {
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env := self.env
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evm := self.evm
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// Depth check execution. Fail if we're trying to execute above the
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// limit.
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if env.Depth() > int(params.CallCreateDepth.Int64()) {
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caller.ReturnGas(self.Gas, self.price)
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return nil, vm.DepthError
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}
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if !env.CanTransfer(env.State().GetStateObject(caller.Address()), self.value) {
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caller.ReturnGas(self.Gas, self.price)
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return nil, ValueTransferErr("insufficient funds to transfer value. Req %v, has %v", self.value, env.State().GetBalance(caller.Address()))
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}
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var createAccount bool
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if self.address == nil {
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// Generate a new address
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nonce := env.State().GetNonce(caller.Address())
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env.State().SetNonce(caller.Address(), nonce+1)
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addr := crypto.CreateAddress(caller.Address(), nonce)
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self.address = &addr
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createAccount = true
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}
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snapshot := env.State().Copy()
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var (
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from = env.State().GetStateObject(caller.Address())
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to *state.StateObject
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)
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if createAccount {
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to = env.State().CreateAccount(*self.address)
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} else {
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to = env.State().GetOrNewStateObject(*self.address)
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}
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vm.Transfer(from, to, self.value)
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context := vm.NewContext(caller, to, self.value, self.Gas, self.price)
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context.SetCallCode(contextAddr, code)
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ret, err = evm.Run(context, self.input)
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if err != nil {
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env.State().Set(snapshot)
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}
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return
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}
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