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Let tools verify that all source file names, line numbers, etc
are valid/present. If there are any bogus entries, it's better
to detect them early, than to crash/error much later when the
info is used.
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Make it possible to use pkg/clangtool with other types than declextract.Output.
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Use resolved Function references instead of string names for fileops
callback resolution. Function names are not unique, a number of callbacks
have the same names.
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To optimize build time kernel/sched compiles a number of source files together
by including them into another source file. As the result static functions
declared in one source file effectively referenced from another source file.
In order to be able to resolve them, we pretend such functions are not static.
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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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Export each syscall variant (e.g. fcnt$*) as a separate interface.
Effectively these are separate syscalls. We will want this for
ioctl as well (it's not 1 interface).
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Use scope-based dataflow analysis for syscall variants (including ioctls).
As the result we only consider code that relates to a partiuclar command/ioctl,
and can infer arguments/return types for each command/ioctl independently.
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Extract info about function scopes formed by switch'es on function arguments.
For example if we have:
void foo(..., int cmd, ...)
{
...
switch (cmd) {
case FOO:
... block 1 ...
case BAR:
... block 2 ...
}
...
}
We record that any data flow within block 1 is only relevant
when foo's arg cmd has value FOO, similarly for block 2 and BAR.
This allows to do 3 things:
1. Locate ioctl commands that are switched on within transitively
called functions.
2. Infer return value for each ioctl command.
3. Infer argument type when it's not specified in _IO macro.
This will also allow to infer other multiplexed syscalls.
Descriptions generated on Linux commit c4b9570cfb63501.
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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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Export raw info about consts from the clang tool, and let the Go part handle it.
The less logic is in the clang tool, the better. Also this will allow to remove
unused includes when we know which consts we ended up using.
The more includes we include, the higher the chances we include something
that's broken.
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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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Extract info about all functions, and compute total LOC for each interface.
For now only static calls are considered, this doesn't handle indirect calls yet.
This is just a groundwork for more complex callgraph/dataflow analysis.
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Currently when entities are added/changed, one may need to update
both pkg/declextract and pkg/clangtool b/c clangtool updates paths.
Move all of that updates to pkg/declextract, so that pkg/clangtool
does not need to be touched when entities change.
The idea behind pkg/clangtool is to provide lower-level infrastructure
function of running the clang tool only.
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Marshal to JSON only once and dedup based on hash before sorting.
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Extend the clang tool to locate file_operations variables and arrays
and dump open/read/write/mmap/ioctl callbacks for each.
It also tries to extract set of ioctl commands and argument types
for them in a simple best-effort way (for now). It just locates switch
in the ioctl callback and extracts each case as a command.
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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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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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