core: vm: refactor file structure

For support other vm types, this pr modified the core/vm file
structures.

1 files changed, 0 insertions, 360 deletions

diff --git a/core/vm/contracts.go b/core/vm/contracts.go
deleted file mode 100644
index ac8fd22df..000000000
--- a/core/vm/contracts.go
+++ /dev/null
@@ -1,360 +0,0 @@
-// Copyright 2014 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 vm
-
-import (
-	"crypto/sha256"
-	"errors"
-	"math/big"
-
-	"github.com/dexon-foundation/dexon/common"
-	"github.com/dexon-foundation/dexon/common/math"
-	"github.com/dexon-foundation/dexon/crypto"
-	"github.com/dexon-foundation/dexon/crypto/bn256"
-	"github.com/dexon-foundation/dexon/params"
-	"golang.org/x/crypto/ripemd160"
-)
-
-// PrecompiledContract is the basic interface for native Go contracts. The implementation
-// requires a deterministic gas count based on the input size of the Run method of the
-// contract.
-type PrecompiledContract interface {
-	RequiredGas(input []byte) uint64  // RequiredPrice calculates the contract gas use
-	Run(input []byte) ([]byte, error) // Run runs the precompiled contract
-}
-
-// PrecompiledContractsHomestead contains the default set of pre-compiled Ethereum
-// contracts used in the Frontier and Homestead releases.
-var PrecompiledContractsHomestead = map[common.Address]PrecompiledContract{
-	common.BytesToAddress([]byte{1}): &ecrecover{},
-	common.BytesToAddress([]byte{2}): &sha256hash{},
-	common.BytesToAddress([]byte{3}): &ripemd160hash{},
-	common.BytesToAddress([]byte{4}): &dataCopy{},
-}
-
-// PrecompiledContractsByzantium contains the default set of pre-compiled Ethereum
-// contracts used in the Byzantium release.
-var PrecompiledContractsByzantium = map[common.Address]PrecompiledContract{
-	common.BytesToAddress([]byte{1}): &ecrecover{},
-	common.BytesToAddress([]byte{2}): &sha256hash{},
-	common.BytesToAddress([]byte{3}): &ripemd160hash{},
-	common.BytesToAddress([]byte{4}): &dataCopy{},
-	common.BytesToAddress([]byte{5}): &bigModExp{},
-	common.BytesToAddress([]byte{6}): &bn256Add{},
-	common.BytesToAddress([]byte{7}): &bn256ScalarMul{},
-	common.BytesToAddress([]byte{8}): &bn256Pairing{},
-}
-
-// RunPrecompiledContract runs and evaluates the output of a precompiled contract.
-func RunPrecompiledContract(p PrecompiledContract, input []byte, contract *Contract) (ret []byte, err error) {
-	gas := p.RequiredGas(input)
-	if contract.UseGas(gas) {
-		return p.Run(input)
-	}
-	return nil, ErrOutOfGas
-}
-
-// ECRECOVER implemented as a native contract.
-type ecrecover struct{}
-
-func (c *ecrecover) RequiredGas(input []byte) uint64 {
-	return params.EcrecoverGas
-}
-
-func (c *ecrecover) Run(input []byte) ([]byte, error) {
-	const ecRecoverInputLength = 128
-
-	input = common.RightPadBytes(input, ecRecoverInputLength)
-	// "input" is (hash, v, r, s), each 32 bytes
-	// but for ecrecover we want (r, s, v)
-
-	r := new(big.Int).SetBytes(input[64:96])
-	s := new(big.Int).SetBytes(input[96:128])
-	v := input[63] - 27
-
-	// tighter sig s values input homestead only apply to tx sigs
-	if !allZero(input[32:63]) || !crypto.ValidateSignatureValues(v, r, s, false) {
-		return nil, nil
-	}
-	// v needs to be at the end for libsecp256k1
-	pubKey, err := crypto.Ecrecover(input[:32], append(input[64:128], v))
-	// make sure the public key is a valid one
-	if err != nil {
-		return nil, nil
-	}
-
-	// the first byte of pubkey is bitcoin heritage
-	return common.LeftPadBytes(crypto.Keccak256(pubKey[1:])[12:], 32), nil
-}
-
-// SHA256 implemented as a native contract.
-type sha256hash struct{}
-
-// RequiredGas returns the gas required to execute the pre-compiled contract.
-//
-// This method does not require any overflow checking as the input size gas costs
-// required for anything significant is so high it's impossible to pay for.
-func (c *sha256hash) RequiredGas(input []byte) uint64 {
-	return uint64(len(input)+31)/32*params.Sha256PerWordGas + params.Sha256BaseGas
-}
-func (c *sha256hash) Run(input []byte) ([]byte, error) {
-	h := sha256.Sum256(input)
-	return h[:], nil
-}
-
-// RIPEMD160 implemented as a native contract.
-type ripemd160hash struct{}
-
-// RequiredGas returns the gas required to execute the pre-compiled contract.
-//
-// This method does not require any overflow checking as the input size gas costs
-// required for anything significant is so high it's impossible to pay for.
-func (c *ripemd160hash) RequiredGas(input []byte) uint64 {
-	return uint64(len(input)+31)/32*params.Ripemd160PerWordGas + params.Ripemd160BaseGas
-}
-func (c *ripemd160hash) Run(input []byte) ([]byte, error) {
-	ripemd := ripemd160.New()
-	ripemd.Write(input)
-	return common.LeftPadBytes(ripemd.Sum(nil), 32), nil
-}
-
-// data copy implemented as a native contract.
-type dataCopy struct{}
-
-// RequiredGas returns the gas required to execute the pre-compiled contract.
-//
-// This method does not require any overflow checking as the input size gas costs
-// required for anything significant is so high it's impossible to pay for.
-func (c *dataCopy) RequiredGas(input []byte) uint64 {
-	return uint64(len(input)+31)/32*params.IdentityPerWordGas + params.IdentityBaseGas
-}
-func (c *dataCopy) Run(in []byte) ([]byte, error) {
-	return in, nil
-}
-
-// bigModExp implements a native big integer exponential modular operation.
-type bigModExp struct{}
-
-var (
-	big1      = big.NewInt(1)
-	big4      = big.NewInt(4)
-	big8      = big.NewInt(8)
-	big16     = big.NewInt(16)
-	big32     = big.NewInt(32)
-	big64     = big.NewInt(64)
-	big96     = big.NewInt(96)
-	big480    = big.NewInt(480)
-	big1024   = big.NewInt(1024)
-	big3072   = big.NewInt(3072)
-	big199680 = big.NewInt(199680)
-)
-
-// RequiredGas returns the gas required to execute the pre-compiled contract.
-func (c *bigModExp) RequiredGas(input []byte) uint64 {
-	var (
-		baseLen = new(big.Int).SetBytes(getData(input, 0, 32))
-		expLen  = new(big.Int).SetBytes(getData(input, 32, 32))
-		modLen  = new(big.Int).SetBytes(getData(input, 64, 32))
-	)
-	if len(input) > 96 {
-		input = input[96:]
-	} else {
-		input = input[:0]
-	}
-	// Retrieve the head 32 bytes of exp for the adjusted exponent length
-	var expHead *big.Int
-	if big.NewInt(int64(len(input))).Cmp(baseLen) <= 0 {
-		expHead = new(big.Int)
-	} else {
-		if expLen.Cmp(big32) > 0 {
-			expHead = new(big.Int).SetBytes(getData(input, baseLen.Uint64(), 32))
-		} else {
-			expHead = new(big.Int).SetBytes(getData(input, baseLen.Uint64(), expLen.Uint64()))
-		}
-	}
-	// Calculate the adjusted exponent length
-	var msb int
-	if bitlen := expHead.BitLen(); bitlen > 0 {
-		msb = bitlen - 1
-	}
-	adjExpLen := new(big.Int)
-	if expLen.Cmp(big32) > 0 {
-		adjExpLen.Sub(expLen, big32)
-		adjExpLen.Mul(big8, adjExpLen)
-	}
-	adjExpLen.Add(adjExpLen, big.NewInt(int64(msb)))
-
-	// Calculate the gas cost of the operation
-	gas := new(big.Int).Set(math.BigMax(modLen, baseLen))
-	switch {
-	case gas.Cmp(big64) <= 0:
-		gas.Mul(gas, gas)
-	case gas.Cmp(big1024) <= 0:
-		gas = new(big.Int).Add(
-			new(big.Int).Div(new(big.Int).Mul(gas, gas), big4),
-			new(big.Int).Sub(new(big.Int).Mul(big96, gas), big3072),
-		)
-	default:
-		gas = new(big.Int).Add(
-			new(big.Int).Div(new(big.Int).Mul(gas, gas), big16),
-			new(big.Int).Sub(new(big.Int).Mul(big480, gas), big199680),
-		)
-	}
-	gas.Mul(gas, math.BigMax(adjExpLen, big1))
-	gas.Div(gas, new(big.Int).SetUint64(params.ModExpQuadCoeffDiv))
-
-	if gas.BitLen() > 64 {
-		return math.MaxUint64
-	}
-	return gas.Uint64()
-}
-
-func (c *bigModExp) Run(input []byte) ([]byte, error) {
-	var (
-		baseLen = new(big.Int).SetBytes(getData(input, 0, 32)).Uint64()
-		expLen  = new(big.Int).SetBytes(getData(input, 32, 32)).Uint64()
-		modLen  = new(big.Int).SetBytes(getData(input, 64, 32)).Uint64()
-	)
-	if len(input) > 96 {
-		input = input[96:]
-	} else {
-		input = input[:0]
-	}
-	// Handle a special case when both the base and mod length is zero
-	if baseLen == 0 && modLen == 0 {
-		return []byte{}, nil
-	}
-	// Retrieve the operands and execute the exponentiation
-	var (
-		base = new(big.Int).SetBytes(getData(input, 0, baseLen))
-		exp  = new(big.Int).SetBytes(getData(input, baseLen, expLen))
-		mod  = new(big.Int).SetBytes(getData(input, baseLen+expLen, modLen))
-	)
-	if mod.BitLen() == 0 {
-		// Modulo 0 is undefined, return zero
-		return common.LeftPadBytes([]byte{}, int(modLen)), nil
-	}
-	return common.LeftPadBytes(base.Exp(base, exp, mod).Bytes(), int(modLen)), nil
-}
-
-// newCurvePoint unmarshals a binary blob into a bn256 elliptic curve point,
-// returning it, or an error if the point is invalid.
-func newCurvePoint(blob []byte) (*bn256.G1, error) {
-	p := new(bn256.G1)
-	if _, err := p.Unmarshal(blob); err != nil {
-		return nil, err
-	}
-	return p, nil
-}
-
-// newTwistPoint unmarshals a binary blob into a bn256 elliptic curve point,
-// returning it, or an error if the point is invalid.
-func newTwistPoint(blob []byte) (*bn256.G2, error) {
-	p := new(bn256.G2)
-	if _, err := p.Unmarshal(blob); err != nil {
-		return nil, err
-	}
-	return p, nil
-}
-
-// bn256Add implements a native elliptic curve point addition.
-type bn256Add struct{}
-
-// RequiredGas returns the gas required to execute the pre-compiled contract.
-func (c *bn256Add) RequiredGas(input []byte) uint64 {
-	return params.Bn256AddGas
-}
-
-func (c *bn256Add) Run(input []byte) ([]byte, error) {
-	x, err := newCurvePoint(getData(input, 0, 64))
-	if err != nil {
-		return nil, err
-	}
-	y, err := newCurvePoint(getData(input, 64, 64))
-	if err != nil {
-		return nil, err
-	}
-	res := new(bn256.G1)
-	res.Add(x, y)
-	return res.Marshal(), nil
-}
-
-// bn256ScalarMul implements a native elliptic curve scalar multiplication.
-type bn256ScalarMul struct{}
-
-// RequiredGas returns the gas required to execute the pre-compiled contract.
-func (c *bn256ScalarMul) RequiredGas(input []byte) uint64 {
-	return params.Bn256ScalarMulGas
-}
-
-func (c *bn256ScalarMul) Run(input []byte) ([]byte, error) {
-	p, err := newCurvePoint(getData(input, 0, 64))
-	if err != nil {
-		return nil, err
-	}
-	res := new(bn256.G1)
-	res.ScalarMult(p, new(big.Int).SetBytes(getData(input, 64, 32)))
-	return res.Marshal(), nil
-}
-
-var (
-	// true32Byte is returned if the bn256 pairing check succeeds.
-	true32Byte = []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}
-
-	// false32Byte is returned if the bn256 pairing check fails.
-	false32Byte = make([]byte, 32)
-
-	// errBadPairingInput is returned if the bn256 pairing input is invalid.
-	errBadPairingInput = errors.New("bad elliptic curve pairing size")
-)
-
-// bn256Pairing implements a pairing pre-compile for the bn256 curve
-type bn256Pairing struct{}
-
-// RequiredGas returns the gas required to execute the pre-compiled contract.
-func (c *bn256Pairing) RequiredGas(input []byte) uint64 {
-	return params.Bn256PairingBaseGas + uint64(len(input)/192)*params.Bn256PairingPerPointGas
-}
-
-func (c *bn256Pairing) Run(input []byte) ([]byte, error) {
-	// Handle some corner cases cheaply
-	if len(input)%192 > 0 {
-		return nil, errBadPairingInput
-	}
-	// Convert the input into a set of coordinates
-	var (
-		cs []*bn256.G1
-		ts []*bn256.G2
-	)
-	for i := 0; i < len(input); i += 192 {
-		c, err := newCurvePoint(input[i : i+64])
-		if err != nil {
-			return nil, err
-		}
-		t, err := newTwistPoint(input[i+64 : i+192])
-		if err != nil {
-			return nil, err
-		}
-		cs = append(cs, c)
-		ts = append(ts, t)
-	}
-	// Execute the pairing checks and return the results
-	if bn256.PairingCheck(cs, ts) {
-		return true32Byte, nil
-	}
-	return false32Byte, nil
-}