gaspersic/go-ethereum
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quad mem

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This commit is contained in:
obscuren
2015-03-03 11:11:11 +01:00
parent fe7ab662f0
commit c1ef19bef9
4 changed files with 53 additions and 16 deletions
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30
vm/vm.go
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@ -812,6 +812,7 @@ var _baseCheck = map[OpCode]req{
COINBASE: {0, GasQuickStep},
TIMESTAMP: {0, GasQuickStep},
NUMBER: {0, GasQuickStep},
CALLDATASIZE: {0, GasQuickStep},
DIFFICULTY: {0, GasQuickStep},
GASLIMIT: {0, GasQuickStep},
POP: {0, GasQuickStep},
@ -862,9 +863,11 @@ func (self *Vm) calculateGasAndSize(context *Context, caller ContextRef, op OpCo
case SWAP1, SWAP2, SWAP3, SWAP4, SWAP5, SWAP6, SWAP7, SWAP8, SWAP9, SWAP10, SWAP11, SWAP12, SWAP13, SWAP14, SWAP15, SWAP16:
n := int(op - SWAP1 + 2)
stack.require(n)
gas.Set(GasFastestStep)
case DUP1, DUP2, DUP3, DUP4, DUP5, DUP6, DUP7, DUP8, DUP9, DUP10, DUP11, DUP12, DUP13, DUP14, DUP15, DUP16:
n := int(op - DUP1 + 1)
stack.require(n)
gas.Set(GasFastestStep)
case LOG0, LOG1, LOG2, LOG3, LOG4:
n := int(op - LOG0)
stack.require(n + 2)
@ -873,11 +876,11 @@ func (self *Vm) calculateGasAndSize(context *Context, caller ContextRef, op OpCo
gas.Add(gas, GasLogBase)
gas.Add(gas, new(big.Int).Mul(big.NewInt(int64(n)), GasLogTopic))
gas.Add(gas, new(big.Int).Mul(mSize, GasLogData))
gas.Add(gas, new(big.Int).Mul(mSize, GasLogByte))
newMemSize = calcMemSize(mStart, mSize)
case EXP:
gas.Add(gas, big.NewInt(int64(len(stack.data[stack.Len()-2].Bytes())+1)))
gas.Add(gas, new(big.Int).Mul(big.NewInt(int64(len(stack.data[stack.Len()-2].Bytes()))), GasExpByte))
case SSTORE:
stack.require(2)
@ -935,7 +938,7 @@ func (self *Vm) calculateGasAndSize(context *Context, caller ContextRef, op OpCo
gas.Add(gas, GasCallNewAccount)
}
if len(stack.data[stack.Len()].Bytes()) > 0 {
if len(stack.data[stack.Len()-1].Bytes()) > 0 {
gas.Add(gas, GasCallValueTransfer)
}
}
@ -953,11 +956,24 @@ func (self *Vm) calculateGasAndSize(context *Context, caller ContextRef, op OpCo
newMemSize.Mul(newMemSize, u256(32))
if newMemSize.Cmp(u256(int64(mem.Len()))) > 0 {
memGasUsage := new(big.Int).Sub(newMemSize, u256(int64(mem.Len())))
memGasUsage.Mul(GasMemWord, memGasUsage)
memGasUsage.Div(memGasUsage, u256(32))
//memGasUsage := new(big.Int).Sub(newMemSize, u256(int64(mem.Len())))
//memGasUsage.Mul(GasMemWord, memGasUsage)
//memGasUsage.Div(memGasUsage, u256(32))
gas.Add(gas, memGasUsage)
//Old: full_memory_gas_cost = W + floor(W*W / 1024), W = words in memory
oldSize := toWordSize(big.NewInt(int64(mem.Len())))
linCoef := new(big.Int).Mul(oldSize, GasMemWord)
pow := new(big.Int)
pow.Exp(oldSize, ethutil.Big2, Zero)
quadCoef := new(big.Int).Div(pow, GasQuadCoeffDenom)
oldTotalFee := new(big.Int).Add(linCoef, quadCoef)
linCoef = new(big.Int).Mul(newMemSize, GasMemWord)
pow.Exp(newMemSize, ethutil.Big2, Zero)
quadCoef = new(big.Int).Div(pow, GasQuadCoeffDenom)
newTotalFee := new(big.Int).Add(linCoef, quadCoef)
gas.Add(gas, new(big.Int).Sub(newTotalFee, oldTotalFee))
}
}