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common: improve documentation comments (#16701)

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This commit adds many comments and removes unused code.
It also removes the EmptyHash function, which had some uses
but was silly.
This commit is contained in:
kiel barry
2018-05-29 03:42:21 -07:00
committed by Felix Lange
parent 998f6564b2
commit 84f8c0cc1f
9 changed files with 84 additions and 138 deletions
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6
core/vm/gas_table.go
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@ -124,12 +124,12 @@ func gasSStore(gt params.GasTable, evm *EVM, contract *Contract, stack *Stack, m
// 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 non-zero to a non-zero (CHANGE)
if common.EmptyHash(val) && !common.EmptyHash(common.BigToHash(y)) {
if val == (common.Hash{}) && y.Sign() != 0 {
// 0 => non 0
return params.SstoreSetGas, nil
} else if !common.EmptyHash(val) && common.EmptyHash(common.BigToHash(y)) {
} else if val != (common.Hash{}) && y.Sign() == 0 {
// non 0 => 0
evm.StateDB.AddRefund(params.SstoreRefundGas)
return params.SstoreClearGas, nil
} else {
// non 0 => non 0 (or 0 => 0)