[WIP] Export lists #19
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Introduce special behavior for the id class with two features: disallow unnamed ids by construction, ensure that ids remain value-comparable. Generally, isl_id behaves like a reference-counted smart pointer to the name string and the user pointer. Additionally, it guarantees that ids with identical names and user pointers are pointer-comparable. An id object can have a "user_free" callback that is called when the reference counter reaches zero. Existing mechanism for callbacks does not apply to "user_free" callbacks as it modifies the user object passed to the callback. In particular, it creates a new object of a custom type in each call of the function that takes a callback and passes it instead of the original user pointer. Therefore, two ids constructed independently from the same user pointer would no longer be pointer-comparable. Therefore, one must pass the user pointer directly. The "user_free" callback must in turn remain a C function pointer. An alternative solution that supports std::function would require maintaining a map between user pointers and custom objects that were passed when constructing isl_ids; however, it would break direct comparability between isl_ids constructed using C and C++ interface. Support void and void * as return and argument types in the generator. Modify the generator to inject custom method declarations and definitions in the class based on the class name. Inject custom constructors, utility methods and comparison operators for isl::id. Custom constructors take either a name or a user pointer, or both. The "user_free" callback can be optionally provided in constructors or set up separately. This callback must be a C function pointer because it will be called from the C code. The user pointer is passed as void *, which can be replaced by template methods in the future, except in the "user_free" callback. The "set_user_free" function is injected so as to avoid handling a special case in callback generation. Signed-off-by: Oleksandr Zinenko <[email protected]>
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Base case for #5. Depends on #18 for generator changes.