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Factor out common clang tool testing helpers from the declextract tool test.
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Make it possible to use pkg/clangtool with other types than declextract.Output.
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Add coverage percent for kernel interfaces.
The current data is generated with Mar coverage report
on kernel commit 1e7857b28020ba57ca7fdafae7ac855ba326c697.
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This may be useful for downstream kernels that only build
and are supposed to be used with a subset of arches.
Some esoteric arches may be broken on such kernels.
Allow to ignore them.
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This fixes 2 bugs:
1. We completly remove empty structs, but they can have
effect on parent struct layout if they have >1 alignment.
Replace empty structs with a special auto_aligner type
that preserves alignment.
2. Arrays of 0 size are currently emitted as dynamically-sized
(we assume 0 size means "this is not a const-size array").
Add separate IsConstSize flag for arrays that marks const-size arrays.
Additionally cross-check that generated structs have exactly
the same size/alignment as the corresponding C structs.
This allows to catch the above bugs.
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Use data flow analysis to infer syscall argument, return value,
and struct field types.
See the comment in pkg/declextract/typing.go for more details.
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Do kernel probing, source code analysis and loading of syscall
rename map in parallel. Also change probe caching to the scheme
we now use for the clang tool cache so the same reasons.
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Instead of caching output for each file separately,
cache total combined output in a single file.
Caching output for each file is not useful in practice,
I either use everything cached, or regenerate whole cache.
Caching combined output is much more efficient.
With function info there are lots of duplication across
individual output files. E.g. I am getting 6GB cache
for individual files, and only 60MB for the combined cache.
Also change how caching works. Remove the flag and always
use the cache if it exists. It's much more convinient and
safer to use (accidentially not using the cache).
The cache file can be removed to force regeneration.
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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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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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