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core/vm: avoid map lookups for accessing jumpdest analysis (#21411)

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Daniel Liu 2024-09-02 15:44:25 +08:00 committed by Daniel Liu
parent a020259bb5
commit 4e832ee6f0
1 changed files with 15 additions and 4 deletions
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19
core/vm/contract.go
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@ -93,16 +93,25 @@ func (c *Contract) validJumpdest(dest *uint256.Int) bool {
if OpCode(c.Code[udest]) != JUMPDEST {
return false
}
// Do we have it locally already?
return c.isCode(udest)
}
// isCode returns true if the provided PC location is an actual opcode, as
// opposed to a data-segment following a PUSHN operation.
func (c *Contract) isCode(udest uint64) bool {
// Do we already have an analysis laying around?
if c.analysis != nil {
return c.analysis.codeSegment(udest)
}
// If we have the code hash (but no analysis), we should look into the
// parent analysis map and see if the analysis has been made previously
// Do we have a contract hash already?
// If we do have a hash, that means it's a 'regular' contract. For regular
// contracts ( not temporary initcode), we store the analysis in a map
if c.CodeHash != (common.Hash{}) {
// Does parent context have the analysis?
analysis, exist := c.jumpdests[c.CodeHash]
if !exist {
// Do the analysis and save in parent context
// We do not need to store it in c.analysis
analysis = codeBitmap(c.Code)
c.jumpdests[c.CodeHash] = analysis
}
@ -114,7 +123,9 @@ func (c *Contract) validJumpdest(dest *uint256.Int) bool {
// in state trie. In that case, we do an analysis, and save it locally, so
// we don't have to recalculate it for every JUMP instruction in the execution
// However, we don't save it within the parent context
c.analysis = codeBitmap(c.Code)
if c.analysis == nil {
c.analysis = codeBitmap(c.Code)
}
return c.analysis.codeSegment(udest)
}