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`IRBlock` contains a few expensive predicates, mostly `getInstruction` and `immediatelyDominates`. These were previously recomputed for each of the three SSA layers even though they essentially produce the same result in each layer. The only difference between the three types of `IRBlock` is the phi nodes. This commit changes the representation of `IRBlock` for `ssa` and `aliased_ssa` so they become just wrappers around the `IRBlock` of their previous layer. Most predicates in later layers are then computed from the corresponding predicate of the preceding layer.
Semmle QL
This open source repository contains the standard QL libraries and queries that power LGTM, and the other products that Semmle makes available to its customers worldwide.
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LGTM has extensive documentation on getting started with writing QL. You can use the interactive query console or the QL for Eclipse plugin to try out your queries on any open-source project that's currently being analyzed.
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