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Make it possible to use pkg/clangtool with other types than declextract.Output.
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Add open callback if there are no other unique callbacks.
This happens for e.g. seq files which only have unique open,
while read is a common seq_read callback.
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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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Currently we misparse some function references, e.g. for:
.write = (foo) ? bar : baz,
we extract "foo". Extract first function reference from such expressions.
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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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Instead of storing real PC values store indexes into the PCs table.
This significantly reduces size of the cache (in my case from
1823 MB to 473 MB) and actually makes use of the cache simpler
(don't need separate map).
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Linter points to very large cyclomatic complexity/length of some functions.
Fix that.
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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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