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This adds builtin:
type bool8 int8[0:1]
type bool16 int16[0:1]
type bool32 int32[0:1]
type bool64 int64[0:1]
type boolptr intptr[0:1]
We used to use just int's for bools.
But bool types provide several advantages:
- make true/false probability equal
- improve description expressiveness
- reduce search space (we will take advantage of this later)
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Complex types that are often repeated can be given short type aliases using the
following syntax:
```
type identifier underlying_type
```
For example:
```
type signalno int32[0:65]
type net_port proc[20000, 4, int16be]
```
Then, type alias can be used instead of the underlying type in any contexts.
Underlying type needs to be described as if it's a struct field, that is,
with the base type if it's required. However, type alias can be used as syscall
arguments as well. Underlying types are currently restricted to integer types,
`ptr`, `ptr64`, `const`, `flags` and `proc` types.
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This is currently unsupported and unused.
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Move most of the logic from sysgen to pkg/compiler.
Update #217
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Update #217
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Now pkg/compiler deals with consts.
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For now we just generate the old structs from the new AST.
But this allows to delete the old parser entirely.
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The old parser in sys/sysparser is too hacky, difficult to extend
and drops debug info too early, so that we can't produce proper error messages.
Add a new parser that is build like a proper language parser
and preserves full debug info for every token.
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