The type system (and the value system) now include attributes
for each type (things like direction, const-ness).
Signed-off-by: Will Hawkins <hawkinsw@obs.cr>
Add support for directions on parameters and attributed types. The
latter is necessary to support the former, but is not limited to
the direction use case. An attributed type is a P4 type with attributes
(like its direction, whether it is read only, etc.) Other attributes
will be added in the future.
Changes necessary to support attributed types include:
1. Global instances tracked during compilation are not attributed
types and not simply types.
2. (future) Type checking will have to make sure that a types
attributes do not affect type compatibility.
Signed-off-by: Will Hawkins <hawkinsw@obs.cr>
Fields were not given default values when a struct was declared
without initializers.
Also, cleanup code in the helper function for binary operations
on struct instances.
Signed-off-by: Will Hawkins <hawkinsw@obs.cr>
1. Add support for field access
2. Add support for proper type checking of array access
3. Add tests for nested field and array access
Signed-off-by: Will Hawkins <hawkinsw@obs.cr>
Refactor into four major components:
1. Common: Things shared among all other components.
2. Lang: P4-language-related components.
3. Runtime: Components required to run a P4 program.
4. Parser: Components for parsing a P4 program from source.
Other components:
1. Macros
2. Tests
3. TreeSitterExtensions: Extra tree sitter functionality
Signed-off-by: Will Hawkins <hawkinsw@obs.cr>
Will Hawkins