| commit | bf2813aab5bdb813fd2998dd725cd03274ec8fdd | [log] [tgz] |
|---|---|---|
| author | tomlu <tomlu@google.com> | Wed Jan 31 15:59:08 2018 -0800 |
| committer | Copybara-Service <copybara-piper@google.com> | Wed Jan 31 16:00:44 2018 -0800 |
| tree | 98b8f13d44f7e26931939f1a0af5db2e23e6141c | |
| parent | 00d781ae78a8bd51d3c61b621d79f0bb095aff9e [diff] |
Improve safety of NestedSetFingerprintCache by detecting multiple instances of the same mapFn class. This code tries to add protection against the user creating new mapFn instances per-rule. This would cause the nested set cache to be computed per-rule instead of shared across rule instances, causing memory bloat and slowdowns. Since this can only happen in native code, we can get away with detecting this and crashing blaze. I think this is a better choice than silently allowing it / falling back to slow computations. The user can override this behaviour by inheriting from CommandLineItem.CapturingMapFn, in which case the user is explicitly saying they assume responsibility for the number of instances of the mapFn the application will use. PiperOrigin-RevId: 184061642
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