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https://github.com/ethereum/go-ethereum.git
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f770d3643b
This changes the internals of the EVM-JIT by dropping support for blocks (and therefor also transactions) that can exceed a 64^2-1 gas-limit. This means that the EVM-JIT can drop support for abritrary precision (*big.Int) and move to 64bit based gas calculations. For obvious reasons integer overflows have added to make sure that gas calculations such as gas for memory doesn't overflow 64bit. If the overflow check fails it throws an out-of-gas error and will halt the execution of the code.
60 lines
1.8 KiB
Go
60 lines
1.8 KiB
Go
// Copyright 2015 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 vm
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import "math/big"
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type jumpSeg struct {
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pos uint64
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err error
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gas uint64
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}
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func (j jumpSeg) do(program *Program, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
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if !contract.UseGas(j.gas) {
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return nil, OutOfGasError
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}
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if j.err != nil {
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return nil, j.err
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}
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*pc = j.pos
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return nil, nil
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}
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func (s jumpSeg) halts() bool { return false }
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func (s jumpSeg) Op() OpCode { return 0 }
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type pushSeg struct {
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data []*big.Int
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gas uint64
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}
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func (s pushSeg) do(program *Program, pc *uint64, env Environment, contract *Contract, memory *Memory, stack *Stack) ([]byte, error) {
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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 !contract.UseGas(s.gas) {
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return nil, OutOfGasError
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}
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for _, d := range s.data {
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stack.push(new(big.Int).Set(d))
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}
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*pc += uint64(len(s.data))
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return nil, nil
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}
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func (s pushSeg) halts() bool { return false }
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func (s pushSeg) Op() OpCode { return 0 }
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