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params: core, core/vm, miner: 64bit gas instructions (#3514)

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Reworked the EVM gas instructions to use 64bit integers rather than
arbitrary size big ints. All gas operations, be it additions,
multiplications or divisions, are checked and guarded against 64 bit
integer overflows.

In additon, most of the protocol paramaters in the params package have
been converted to uint64 and are now constants rather than variables.

* common/math: added overflow check ops
* core: vmenv, env renamed to evm
* eth, internal/ethapi, les: unmetered eth_call and cancel methods
* core/vm: implemented big.Int pool for evm instructions
* core/vm: unexported intPool methods & verification methods
* core/vm: added memoryGasCost overflow check and test
This commit is contained in:
Jeffrey Wilcke
2017-02-02 15:25:42 +01:00
committed by GitHub
parent 296450451b
commit 8b57c49490
47 changed files with 1043 additions and 784 deletions
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39
core/vm/contracts.go
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@ -17,8 +17,6 @@
package vm
import (
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/logger"
@ -30,8 +28,8 @@ import (
// requires a deterministic gas count based on the input size of the Run method of the
// contract.
type PrecompiledContract interface {
RequiredGas(inputSize int) *big.Int // RequiredPrice calculates the contract gas use
Run(input []byte) []byte // Run runs the precompiled contract
RequiredGas(inputSize int) uint64 // RequiredPrice calculates the contract gas use
Run(input []byte) []byte // Run runs the precompiled contract
}
// Precompiled contains the default set of ethereum contracts
@ -57,7 +55,7 @@ func RunPrecompiledContract(p PrecompiledContract, input []byte, contract *Contr
// ECRECOVER implemented as a native contract
type ecrecover struct{}
func (c *ecrecover) RequiredGas(inputSize int) *big.Int {
func (c *ecrecover) RequiredGas(inputSize int) uint64 {
return params.EcrecoverGas
}
@ -92,10 +90,12 @@ func (c *ecrecover) Run(in []byte) []byte {
// SHA256 implemented as a native contract
type sha256 struct{}
func (c *sha256) RequiredGas(inputSize int) *big.Int {
n := big.NewInt(int64(inputSize+31) / 32)
n.Mul(n, params.Sha256WordGas)
return n.Add(n, params.Sha256Gas)
// 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 *sha256) RequiredGas(inputSize int) uint64 {
return uint64(inputSize+31)/32*params.Sha256WordGas + params.Sha256Gas
}
func (c *sha256) Run(in []byte) []byte {
return crypto.Sha256(in)
@ -104,10 +104,12 @@ func (c *sha256) Run(in []byte) []byte {
// RIPMED160 implemented as a native contract
type ripemd160 struct{}
func (c *ripemd160) RequiredGas(inputSize int) *big.Int {
n := big.NewInt(int64(inputSize+31) / 32)
n.Mul(n, params.Ripemd160WordGas)
return n.Add(n, params.Ripemd160Gas)
// 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 *ripemd160) RequiredGas(inputSize int) uint64 {
return uint64(inputSize+31)/32*params.Ripemd160WordGas + params.Ripemd160Gas
}
func (c *ripemd160) Run(in []byte) []byte {
return common.LeftPadBytes(crypto.Ripemd160(in), 32)
@ -116,11 +118,12 @@ func (c *ripemd160) Run(in []byte) []byte {
// data copy implemented as a native contract
type dataCopy struct{}
func (c *dataCopy) RequiredGas(inputSize int) *big.Int {
n := big.NewInt(int64(inputSize+31) / 32)
n.Mul(n, params.IdentityWordGas)
return n.Add(n, params.IdentityGas)
// 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(inputSize int) uint64 {
return uint64(inputSize+31)/32*params.IdentityWordGas + params.IdentityGas
}
func (c *dataCopy) Run(in []byte) []byte {
return in