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Emit descriptions for special files in /dev, /sys, /proc, and ./.
pkg/declextract combines file_operations info produced by the clang tool
with the dynamic probing info produced by pkg/ifaceprobe in order
to produce complete descriptions for special files.
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Emit families w/o policy, emit duplicate commands.
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Emit all information related to a single netlink family close to each other.
Previously we emitted them scattered and grouped by info type.
That was both inconvinient to emit and inconvinient to read.
NFC.
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Currently we append "$auto", or "$auto_record", or prepend "auto_",
or insert "auto" somewhere in the middle.
Use more consistent naming: always append "$auto".
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syz-declextract accumulated a bunch of code health problems
so that now it's hard to change/extend it, lots of new features
can only be added in in hacky ways and cause lots of code duplication.
It's also completly untested. Rewrite the tool to:
- move as much code as possible to Go (working with the clang tool
is painful for a number of reasons)
- allow testing and add unit tests (first layer of tests test
what information is produced by the clang tool, second layer
of tests test how that information is transformed to descriptions)
- allow extending the clang tool output to export arbitrary info
in non-hacky way (now it produces arbitrary JSON instead of a mix
of incomplete descriptions and interfaces)
- remove code duplication in the clang tool and provide common
infrastructure to add new analysis w/o causing more duplication
- provide more convinient primitives in the clang tool
- improve code style consistency and stick to the LLVM code style
(in particular, variable names must start with a capital letter,
single-statement blocks are not surrounded with {})
- remove intermixing of code that works on different levels
(currently we have AST analysis + busness logic + printfs
all intermixed with each other)
- provide several helper Go packages for better code structuring
(e.g. pkg/clangtool just runs the tool on source files in parallel
and returns results, this already separates a bunch of low-level
logic from the rest of the code under a simple abstraction)
I've tried to make the output match the current output as much as possible
so that the diff is managable (in some cases at the cost of code quality,
this should be fixed in future commits). There are still some differences,
but hopefully they are managable for review (more includes/defines,
reordered some netlink attributes).
Fixed minor bugs are fixed along the way, but mostly NFC:
1. Some unions were incorrectly emitted as [varlen]
(C unions are never varlen).
2. Only a of [packed], [align[N]] attributes was emitted
for struct (both couldn't be emitted).
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