core, core/state, trie: EIP158, reprice & skip empty account write

This commit implements EIP158 part 1, 2, 3 & 4

1. If an account is empty it's no longer written to the trie. An empty
  account is defined as (balance=0, nonce=0, storage=0, code=0).
2. Delete an empty account if it's touched
3. An empty account is redefined as either non-existent or empty.
4. Zero value calls and zero value suicides no longer consume the 25k
  reation costs.

params: moved core/config to params

Signed-off-by: Jeffrey Wilcke <jeffrey@ethereum.org>

1 files changed, 0 insertions, 63 deletions

diff --git a/core/config.go b/core/config.go
deleted file mode 100644
index 96e39ea3c..000000000
--- a/core/config.go
+++ /dev/null
@@ -1,63 +0,0 @@
-// Copyright 2016 The go-ethereum Authors
-// This file is part of the go-ethereum library.
-//
-// The go-ethereum library is free software: you can redistribute it and/or modify
-// it under the terms of the GNU Lesser General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// The go-ethereum library is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU Lesser General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public License
-// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
-
-package core
-
-import (
-	"errors"
-	"math/big"
-
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/core/vm"
-	"github.com/ethereum/go-ethereum/params"
-)
-
-var ChainConfigNotFoundErr = errors.New("ChainConfig not found") // general config not found error
-
-// ChainConfig is the core config which determines the blockchain settings.
-//
-// ChainConfig is stored in the database on a per block basis. This means
-// that any network, identified by its genesis block, can have its own
-// set of configuration options.
-type ChainConfig struct {
-	HomesteadBlock *big.Int `json:"homesteadBlock"` // Homestead switch block (nil = no fork, 0 = already homestead)
-	DAOForkBlock   *big.Int `json:"daoForkBlock"`   // TheDAO hard-fork switch block (nil = no fork)
-	DAOForkSupport bool     `json:"daoForkSupport"` // Whether the nodes supports or opposes the DAO hard-fork
-
-	HomesteadGasRepriceBlock *big.Int    `json:"homesteadGasRepriceBlock"` // Homestead gas reprice switch block (nil = no fork)
-	HomesteadGasRepriceHash  common.Hash `json:"homesteadGasRepriceHash"`  // Homestead gas reprice switch block hash (fast sync aid)
-
-	VmConfig vm.Config `json:"-"`
-}
-
-// IsHomestead returns whether num is either equal to the homestead block or greater.
-func (c *ChainConfig) IsHomestead(num *big.Int) bool {
-	if c.HomesteadBlock == nil || num == nil {
-		return false
-	}
-	return num.Cmp(c.HomesteadBlock) >= 0
-}
-
-// GasTable returns the gas table corresponding to the current phase (homestead or homestead reprice).
-//
-// The returned GasTable's fields shouldn't, under any circumstances, be changed.
-func (c *ChainConfig) GasTable(num *big.Int) params.GasTable {
-	if c.HomesteadGasRepriceBlock == nil || num == nil || num.Cmp(c.HomesteadGasRepriceBlock) < 0 {
-		return params.GasTableHomestead
-	}
-
-	return params.GasTableHomesteadGasRepriceFork
-}