forked from cerc-io/plugeth
core/vm: improve jumpdest lookup (#21123)
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25a661e0c2
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e868adde30
@ -92,25 +92,28 @@ func (c *Contract) validJumpdest(dest *big.Int) bool {
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if OpCode(c.Code[udest]) != JUMPDEST {
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return false
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}
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// Do we have a contract hash already?
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// Do we have it locally already?
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if c.analysis != nil {
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return c.analysis.codeSegment(udest)
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}
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// If we have the code hash (but no analysis), we should look into the
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// parent analysis map and see if the analysis has been made previously
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if c.CodeHash != (common.Hash{}) {
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// Does parent context have the analysis?
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analysis, exist := c.jumpdests[c.CodeHash]
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if !exist {
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// Do the analysis and save in parent context
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// We do not need to store it in c.analysis
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analysis = codeBitmap(c.Code)
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c.jumpdests[c.CodeHash] = analysis
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}
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// Also stash it in current contract for faster access
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c.analysis = analysis
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return analysis.codeSegment(udest)
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}
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// We don't have the code hash, most likely a piece of initcode not already
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// in state trie. In that case, we do an analysis, and save it locally, so
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// we don't have to recalculate it for every JUMP instruction in the execution
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// However, we don't save it within the parent context
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if c.analysis == nil {
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c.analysis = codeBitmap(c.Code)
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}
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c.analysis = codeBitmap(c.Code)
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return c.analysis.codeSegment(udest)
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}
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