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core/vm: clarified SSTORE

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This commit is contained in:
obscuren 2015-06-18 12:25:02 +02:00
parent 15e169e5b6
commit 430bcdb219
1 changed files with 5 additions and 7 deletions
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12
core/vm/vm.go
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@ -686,6 +686,11 @@ func (self *Vm) calculateGasAndSize(context *Context, caller ContextRef, op OpCo
var g *big.Int var g *big.Int
y, x := stack.data[stack.len()-2], stack.data[stack.len()-1] y, x := stack.data[stack.len()-2], stack.data[stack.len()-1]
val := statedb.GetState(context.Address(), common.BigToHash(x)) val := statedb.GetState(context.Address(), common.BigToHash(x))
// This checks for 3 scenario's and calculates gas accordingly
// 1. From a zero-value address to a non-zero value (NEW VALUE)
// 2. From a non-zero value address to a zero-value address (DELETE)
// 3. From a nen-zero to a non-zero (CHANGE)
if common.EmptyHash(val) && !common.EmptyHash(common.BigToHash(y)) { if common.EmptyHash(val) && !common.EmptyHash(common.BigToHash(y)) {
// 0 => non 0 // 0 => non 0
g = params.SstoreSetGas g = params.SstoreSetGas
@ -697,13 +702,6 @@ func (self *Vm) calculateGasAndSize(context *Context, caller ContextRef, op OpCo
// non 0 => non 0 (or 0 => 0) // non 0 => non 0 (or 0 => 0)
g = params.SstoreClearGas g = params.SstoreClearGas
} }
/*
if len(val) == 0 && len(y.Bytes()) > 0 {
} else if len(val) > 0 && len(y.Bytes()) == 0 {
} else {
}
*/
gas.Set(g) gas.Set(g)
case SUICIDE: case SUICIDE:
if !statedb.IsDeleted(context.Address()) { if !statedb.IsDeleted(context.Address()) {