forked from cerc-io/plugeth
core/vm: clarified SSTORE
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15e169e5b6
commit
430bcdb219
@ -686,6 +686,11 @@ func (self *Vm) calculateGasAndSize(context *Context, caller ContextRef, op OpCo
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var g *big.Int
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y, x := stack.data[stack.len()-2], stack.data[stack.len()-1]
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val := statedb.GetState(context.Address(), common.BigToHash(x))
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// This checks for 3 scenario's and calculates gas accordingly
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// 1. From a zero-value address to a non-zero value (NEW VALUE)
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// 2. From a non-zero value address to a zero-value address (DELETE)
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// 3. From a nen-zero to a non-zero (CHANGE)
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if common.EmptyHash(val) && !common.EmptyHash(common.BigToHash(y)) {
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// 0 => non 0
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g = params.SstoreSetGas
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@ -697,13 +702,6 @@ func (self *Vm) calculateGasAndSize(context *Context, caller ContextRef, op OpCo
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// non 0 => non 0 (or 0 => 0)
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g = params.SstoreClearGas
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}
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/*
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if len(val) == 0 && len(y.Bytes()) > 0 {
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} else if len(val) > 0 && len(y.Bytes()) == 0 {
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} else {
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}
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*/
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gas.Set(g)
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case SUICIDE:
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if !statedb.IsDeleted(context.Address()) {
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