fix[codegen]: fix assertions for certain precompiles #4451
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in 93a9579, the assert for memory copying calls to the identity precompile was optimized out; the reasoning being that if the identity precompile fails due to OOG, the caller contract would also likely fail with OOG. however, due to the 63/64ths rule, there are cases where the identity precompile could fail with OOG, but the caller contract has enough gas to successfully return out of the call context. (note that even prior to 93a9579, some calls to the identity precompile did not check the success flag. cf. commit cf03d27). this only affects pre-cancun compilation targets, since post-cancun the `mcopy` instruction is chosen. this commit fixes the identity precompile call for pre-cancun targets. a similar optimization was also applied in the past to omit the check when calling the ecrecover precompile. a check for the ecrecover call is applied in this commit. while this is a performance regression, ecrecover is generally not a hotspot; as for the identity precompile, it is only used by the compiler for memory copies pre-cancun, so the performance regression there is not too relevant (as of nov 2024).
Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## master #4451 +/- ##
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Coverage 92.01% 92.01%
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Files 119 119
Lines 16692 16692
Branches 2805 2805
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Hits 15359 15359
Misses 915 915
Partials 418 418 ☔ View full report in Codecov by Sentry. |
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aren't the tests using |
gas_used - 1 will always revert. we want to supply enough gas that the inner call will return 0 but the outer call will not oog.
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What I did
fix for GHSA-vgf2-gvx8-xwc3
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