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core/vm: save jumpdest analysis locally

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Martin Holst Swende 2018-10-03 08:57:38 +02:00
parent 880f6981a5
commit 72f655d421
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1 changed files with 9 additions and 4 deletions
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13
core/vm/contract.go
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@ -50,6 +50,7 @@ type Contract struct {
self ContractRef self ContractRef
jumpdests destinations // Aggregated result of JUMPDEST analysis. jumpdests destinations // Aggregated result of JUMPDEST analysis.
analysis bitvec // Locally cached result of JUMPDEST analysis
Code []byte Code []byte
CodeHash *common.Hash CodeHash *common.Hash
@ -105,10 +106,14 @@ func (c *Contract) validJumpdest(dest *big.Int) bool {
} }
return analysis.codeSegment(udest) return analysis.codeSegment(udest)
} }
//Don't have the hash, most likely a piece of initcode not already in state trie // We don't have the code hash, most likely a piece of initcode not already
analysis = codeBitmap(c.Code) // in state trie. In that case, we do an analysis, and save it locally, so
// Don't bother saving this // we don't have to recalculate it for every JUMP instruction in the execution
return analysis.codeSegment(udest) // However, we don't save it within the parent context
if c.analysis == nil {
c.analysis = codeBitmap(c.Code)
}
return c.analysis.codeSegment(udest)
} }
// AsDelegate sets the contract to be a delegate call and returns the current // AsDelegate sets the contract to be a delegate call and returns the current