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all: switch gas limits from big.Int to uint64

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This commit is contained in:
Péter Szilágyi
2017-11-13 13:47:27 +02:00
parent b8caba9709
commit 6f69cdd109
82 changed files with 606 additions and 642 deletions
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36
core/block_validator.go
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@ -18,9 +18,7 @@ package core
import (
"fmt"
"math/big"
"github.com/ethereum/go-ethereum/common/math"
"github.com/ethereum/go-ethereum/consensus"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/core/types"
@ -76,10 +74,10 @@ func (v *BlockValidator) ValidateBody(block *types.Block) error {
// transition, such as amount of used gas, the receipt roots and the state root
// itself. ValidateState returns a database batch if the validation was a success
// otherwise nil and an error is returned.
func (v *BlockValidator) ValidateState(block, parent *types.Block, statedb *state.StateDB, receipts types.Receipts, usedGas *big.Int) error {
func (v *BlockValidator) ValidateState(block, parent *types.Block, statedb *state.StateDB, receipts types.Receipts, usedGas uint64) error {
header := block.Header()
if block.GasUsed().Cmp(usedGas) != 0 {
return fmt.Errorf("invalid gas used (remote: %v local: %v)", block.GasUsed(), usedGas)
if block.GasUsed() != usedGas {
return fmt.Errorf("invalid gas used (remote: %d local: %d)", block.GasUsed(), usedGas)
}
// Validate the received block's bloom with the one derived from the generated receipts.
// For valid blocks this should always validate to true.
@ -101,17 +99,13 @@ func (v *BlockValidator) ValidateState(block, parent *types.Block, statedb *stat
}
// CalcGasLimit computes the gas limit of the next block after parent.
// The result may be modified by the caller.
// This is miner strategy, not consensus protocol.
func CalcGasLimit(parent *types.Block) *big.Int {
func CalcGasLimit(parent *types.Block) uint64 {
// contrib = (parentGasUsed * 3 / 2) / 1024
contrib := new(big.Int).Mul(parent.GasUsed(), big.NewInt(3))
contrib = contrib.Div(contrib, big.NewInt(2))
contrib = contrib.Div(contrib, params.GasLimitBoundDivisor)
contrib := (parent.GasUsed() + parent.GasUsed()/2) / params.GasLimitBoundDivisor
// decay = parentGasLimit / 1024 -1
decay := new(big.Int).Div(parent.GasLimit(), params.GasLimitBoundDivisor)
decay.Sub(decay, big.NewInt(1))
decay := parent.GasLimit()/params.GasLimitBoundDivisor - 1
/*
strategy: gasLimit of block-to-mine is set based on parent's
@ -120,15 +114,17 @@ func CalcGasLimit(parent *types.Block) *big.Int {
at that usage) the amount increased/decreased depends on how far away
from parentGasLimit * (2/3) parentGasUsed is.
*/
gl := new(big.Int).Sub(parent.GasLimit(), decay)
gl = gl.Add(gl, contrib)
gl.Set(math.BigMax(gl, params.MinGasLimit))
limit := parent.GasLimit() - decay + contrib
if limit < params.MinGasLimit {
limit = params.MinGasLimit
}
// however, if we're now below the target (TargetGasLimit) we increase the
// limit as much as we can (parentGasLimit / 1024 -1)
if gl.Cmp(params.TargetGasLimit) < 0 {
gl.Add(parent.GasLimit(), decay)
gl.Set(math.BigMin(gl, params.TargetGasLimit))
if limit < params.TargetGasLimit {
limit = parent.GasLimit() + decay
if limit > params.TargetGasLimit {
limit = params.TargetGasLimit
}
}
return gl
return limit
}