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cmd/evm, core/vm, test: refactored VM and core

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* Moved `vm.Transfer` to `core` package and changed execution to call
`env.Transfer` instead of `core.Transfer` directly.
* core/vm: byte code VM moved to jump table instead of switch
* Moved `vm.Transfer` to `core` package and changed execution to call
  `env.Transfer` instead of `core.Transfer` directly.
* Byte code VM now shares the same code as the JITVM
* Renamed Context to Contract
* Changed initialiser of state transition & unexported methods
* Removed the Execution object and refactor `Call`, `CallCode` &
  `Create` in to their own functions instead of being methods.
* Removed the hard dep on the state for the VM. The VM now
  depends on a Database interface returned by the environment. In the
  process the core now depends less on the statedb by usage of the env
* Moved `Log` from package `core/state` to package `core/vm`.
This commit is contained in:
Jeffrey Wilcke
2015-08-30 10:19:10 +02:00
parent f7a71996fb
commit 361082ec4b
39 changed files with 966 additions and 1082 deletions
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55
core/vm/common.go
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@ -22,34 +22,34 @@ import (
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/params"
)
// Global Debug flag indicating Debug VM (full logging)
var Debug bool
// Type is the VM type accepted by **NewVm**
type Type byte
const (
StdVmTy Type = iota
JitVmTy
StdVmTy Type = iota // Default standard VM
JitVmTy // LLVM JIT VM
MaxVmTy
LogTyPretty byte = 0x1
LogTyDiff byte = 0x2
)
var (
Pow256 = common.BigPow(2, 256)
Pow256 = common.BigPow(2, 256) // Pew256 is 2**256
U256 = common.U256
S256 = common.S256
U256 = common.U256 // Shortcut to common.U256
S256 = common.S256 // Shortcut to common.S256
Zero = common.Big0
One = common.Big1
Zero = common.Big0 // Shortcut to common.Big0
One = common.Big1 // Shortcut to common.Big1
max = big.NewInt(math.MaxInt64)
max = big.NewInt(math.MaxInt64) // Maximum 256 bit integer
)
// NewVm returns a new VM based on the Environment
func NewVm(env Environment) VirtualMachine {
switch env.VmType() {
case JitVmTy:
@ -62,6 +62,7 @@ func NewVm(env Environment) VirtualMachine {
}
}
// calculates the memory size required for a step
func calcMemSize(off, l *big.Int) *big.Int {
if l.Cmp(common.Big0) == 0 {
return common.Big0
@ -70,6 +71,32 @@ func calcMemSize(off, l *big.Int) *big.Int {
return new(big.Int).Add(off, l)
}
// calculates the quadratic gas
func quadMemGas(mem *Memory, newMemSize, gas *big.Int) {
if newMemSize.Cmp(common.Big0) > 0 {
newMemSizeWords := toWordSize(newMemSize)
newMemSize.Mul(newMemSizeWords, u256(32))
if newMemSize.Cmp(u256(int64(mem.Len()))) > 0 {
// be careful reusing variables here when changing.
// The order has been optimised to reduce allocation
oldSize := toWordSize(big.NewInt(int64(mem.Len())))
pow := new(big.Int).Exp(oldSize, common.Big2, Zero)
linCoef := oldSize.Mul(oldSize, params.MemoryGas)
quadCoef := new(big.Int).Div(pow, params.QuadCoeffDiv)
oldTotalFee := new(big.Int).Add(linCoef, quadCoef)
pow.Exp(newMemSizeWords, common.Big2, Zero)
linCoef = linCoef.Mul(newMemSizeWords, params.MemoryGas)
quadCoef = quadCoef.Div(pow, params.QuadCoeffDiv)
newTotalFee := linCoef.Add(linCoef, quadCoef)
fee := newTotalFee.Sub(newTotalFee, oldTotalFee)
gas.Add(gas, fee)
}
}
}
// Simple helper
func u256(n int64) *big.Int {
return big.NewInt(n)
@ -86,6 +113,8 @@ func toValue(val *big.Int) interface{} {
return val
}
// getData returns a slice from the data based on the start and size and pads
// up to size with zero's. This function is overflow safe.
func getData(data []byte, start, size *big.Int) []byte {
dlen := big.NewInt(int64(len(data)))
@ -94,7 +123,9 @@ func getData(data []byte, start, size *big.Int) []byte {
return common.RightPadBytes(data[s.Uint64():e.Uint64()], int(size.Uint64()))
}
func UseGas(gas, amount *big.Int) bool {
// useGas attempts to subtract the amount of gas and returns whether it was
// successful
func useGas(gas, amount *big.Int) bool {
if gas.Cmp(amount) < 0 {
return false
}