Run static analysis on OCaml C stubs in the CI #6338
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psafont
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Mar 4, 2025
There is also a 'make analyze' to run this locally. Signed-off-by: Edwin Török <[email protected]>
Macros beginning with `_` are reserved by the language. Fixes a CodeChecker warning. Signed-off-by: Edwin Török <[email protected]>
Fixes a warning reported by codechecker Signed-off-by: Edwin Török <[email protected]>
Signed-off-by: Edwin Török <[email protected]>
Analyzer can't figure out that 'rc' is set on 'fd < 0', and we never try to use 'size_in_bytes'. Appears to be a limitation in the analyzer, it doesn't realize that `fd < 0` implies that `rc` is set to `NOT_IMPLEMENTED`, which raises an exception, so `caml_copy_int64` is never reached. But the logic there is quite hard to follow, so better be explicit, and ensure `size_in_bytes` is always initialized. Signed-off-by: Edwin Török <[email protected]>
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psafont
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Mar 5, 2025
contificate
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Mar 5, 2025
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Similar to the static analyzer introduced in xha, but for OCaml C stubs.
This uses my https://ocaml.org/p/dune-compiledb/latest to product a
compile_commands.jsonfor the C stubs out of thedunerules (which can also be useful if you want to useclangdand get some editor integration about compiler warnings). This requires installing enough of the build dependencies to be able to rundunesuccessfully (perhaps in the future that restriction can be removed). Caching is used though, and we only need to install the build deps whendunefiles change, otherwise we can reuse a cachedcompile_commands.json.Static analyzers, like CodeChecker support reading
compile_commands.jsonand invoking static analyzers with the appropriate flags to preprocess, and analyze the C source code. We useclang,clang-tidyandcppcheckas the default analyzers, although more analyzers could be added in the future (CodeChecker supports convertinggcc -fanalyzeroutput for example. GCC also supports emiting SARIF format directly, but github cannot parse it, because it doesn't implement the full SARIF spec).At the end we convert the results back to the standard SARIF format that Github also supports for its code scanning results, which will make it automatically add comments on PRs that introduce new bugs, without necessarily gating on them.
I fixed some of the most obvious warnings, and suppressed some minor ones that we cannot fix (where the warning is caused by a Xen or OCaml header). More warnings can be skipped by adding to
.codechecker.jsonif needed.So far it seems to have found a file descriptor leak in
unixpwd.con an error path, but I haven't gone through all the reports in detail yet.