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For any intN, values in the range [-MAX_INTN:MAX_INTN] are accepted.
Signed-off-by: Paul Chaignon <paul.chaignon@orange.com>
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Enables the syntax intN[start:end, alignment] for integer ranges. For
instance, int32[0:10, 2] represents even 32-bit numbers between 0 and 10
included. With this change, two NEED tags in syscall descriptions can be
addressed.
Signed-off-by: Paul Chaignon <paul.chaignon@orange.com>
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Similar to C offsetof gives offset of a field
from the beginning of the parent struct.
We have several TODOs in descriptions asking for this.
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This allows to use len[syscall:arg] expressions.
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This change adds compiler support for complex path
expressions in len targets. E.g. it allows to refer
to a sibling field as len[parent_struct:field:another_field].
See the docs change for details.
This is just a compiler change.
The feature is not yet supported by the prog package.
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Currently we have to use 0xffffffffffffffff to represent -1,
and we can't express e.g. -20:20 int range.
Support negative consts to fix both problems.
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Error on unused structs/unions/resources/flags.
Finds tons of bugs.
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Frequently it's useful to do something like:
int8['a':'z']
punctuation = ',', '-', ':'
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The size attribute allows to pad a struct up to the specified size.
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All netfilter subsystems use this unfortunately,
so demote this to a warning.
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Netlink descriptions contain tons of code duplication,
and need much more for proper descriptions. Introduce
type templates to simplify writing such descriptions
and remove code duplication.
Note: type templates are experimental, have poor error handling
and are subject to change.
Type templates can be declared as follows:
```
type buffer[DIR] ptr[DIR, array[int8]]
type fileoff[BASE] BASE
type nlattr[TYPE, PAYLOAD] {
nla_len len[parent, int16]
nla_type const[TYPE, int16]
payload PAYLOAD
} [align_4]
```
and later used as follows:
```
syscall(a buffer[in], b fileoff[int64], c ptr[in, nlattr[FOO, int32]])
```
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This [almost] always means a bug in descriptions.
Fix all bugs identified by the check.
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We used to generate them only because manager had no idea
what arch it is testing. So syscalls numbers had to match
between all arches.
This is not needed anymore.
Also don't generate unreferenced structs/resources.
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This makes types constant during execution, everything is precomputed.
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Fixes #217
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