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triedb/pathdb: update comment

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This commit is contained in:
Gary Rong 2025-05-27 13:52:19 +08:00
parent 8f9c277fe9
commit 79617eea5b
1 changed files with 26 additions and 0 deletions
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26
triedb/pathdb/lookup.go
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@ -83,8 +83,30 @@ func newLookup(head layer, descendant func(state common.Hash, ancestor common.Ha
// layer specified by the stateID: fallback to the disk layer for data retrieval,
// (b) or the layer specified by the stateID is stale: reject the data retrieval.
func (l *lookup) accountTip(accountHash common.Hash, stateID common.Hash, base common.Hash) common.Hash {
// Traverse the mutation history from latest to oldest one. Several
// scenarios are possible:
//
// Chain:
// D->C1->C2->C3->C4 (HEAD)
// ->C1'->C2'->C3'
// State:
// x: [C1, C1', C3', C3]
// y: []
//
// - (x, C4) => C3
// - (x, C3) => C3
// - (x, C2) => C1
// - (x, C3') => C3'
// - (x, C2') => C1'
// - (y, C4) => D
// - (y, C3') => D
// - (y, C0) => null
list := l.accounts[accountHash]
for i := len(list) - 1; i >= 0; i-- {
// If the current state matches the stateID, or the requested state is a
// descendant of it, return the current state as the most recent one
// containing the modified data. Otherwise, the current state may be ahead
// of the requested one or belong to a different branch.
if list[i] == stateID || l.descendant(stateID, list[i]) {
return list[i]
}
@ -115,6 +137,10 @@ func (l *lookup) storageTip(accountHash common.Hash, slotHash common.Hash, state
if exists {
list := subset[slotHash]
for i := len(list) - 1; i >= 0; i-- {
// If the current state matches the stateID, or the requested state is a
// descendant of it, return the current state as the most recent one
// containing the modified data. Otherwise, the current state may be ahead
// of the requested one or belong to a different branch.
if list[i] == stateID || l.descendant(stateID, list[i]) {
return list[i]
}