C++: Do not alert on unreachable code in cpp/incorrect-string-type-conversion
#20014
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MathiasVP
reviewed
Jul 10, 2025
| not isLikelyDynamicallyChecked(e1) | ||
| not isLikelyDynamicallyChecked(e1) and | ||
| // Avoid cases in unreachable blocks. | ||
| any(EnterFunctionInstruction e).getASuccessor+().getAst() = e1 |
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I imagine this transitive closure is sufficiently constrained so that this doesn't matter much, but in case DCA comes back with a performance problem it may be worth doing getASuccessor+() on basic blocks instead of individual instructions since that's much much more efficient (simply because there are a lot fewer basic blocks than there are instructions).
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I didn't see any performance problems, but out of curiosity, how would I rewrite the code in that case?
any(EnterFunctionInstruction e).getBlock().getASuccessor+() =
any(Instruction i | i.getAst() = e1).getBlock()Or is there any easier way?
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Something like that, yeah. Probably with * instead of + to handle the case where e1 is in the same block as the entry point of the function.
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