9df37399f8
Previously, we had several predicates on `Instruction` and `Operand` whose values were determined solely by the opcode of the instruction. For large snapshots, this meant that we would populate large tables mapping each of the millions of `Instruction`s to the appropriate value, times three (once for each IR flavor). This change moves all of these opcode properties onto `Opcode` itself, with inline wrapper predicates on `Instruction` and `Operand` where necessary. On smaller snapshots, like ChakraCore, performance is a wash, but this did speed up Wireshark by about 4%. Even ignoring the modest performance benefit, having these properties defined on `Opcode` seems like a better organization than having them on `Instruction` and `Operand`.
CodeQL
This open source repository contains the standard CodeQL libraries and queries that power LGTM, and the other products that Semmle makes available to its customers worldwide.
How do I learn CodeQL and run queries?
There is extensive documentation on getting started with writing CodeQL. You can use the interactive query console on LGTM.com or the CodeQL for Visual Studio Code extension to try out your queries on any open source project that's currently being analyzed.
Contributing
We welcome contributions to our standard library and standard checks. Do you have an idea for a new check, or how to improve an existing query? Then please go ahead and open a pull request! Before you do, though, please take the time to read our contributing guidelines. You can also consult our style guides to learn how to format your code for consistency and clarity, how to write query metadata, and how to write query help documentation for your query.
License
The code in this repository is licensed under Apache License 2.0 by Semmle.