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* oop: add tests for diamond problem.Kaz Kylheku2020-09-011-2/+10
| | | | | | | | * tests/012/oop-mi.tl (grand, base1, base2): Add list slot li to grand, targeted by :init and :fini handlers in all three structs. Added test case which triggers finalization. * tests/012/oop-mi.expected: Updated.
* multiple-inheritance: test static-slot-home.Kaz Kylheku2019-12-131-0/+3
| | | | | | | * tests/012/oop-mi.tl: Add some coverage for static-slot-home function. * tests/012/oop-mi.expected: Updated.
* multiple-inheritance: super-method loose ends.Kaz Kylheku2019-12-131-0/+6
| | | | | | | | | | | | | | | | | * struct.c (do_super): New function. Now the common implementation for call_super_method, call_super_fun and super_method. (call_super_method, call_super_fun): Reduced to small wrappers around do_super. (super_method): Drill into the object to geet the struct_type handle, and then use do_super to get the method. * tests/012/oop-mi.tl: New tests for call-super-fun and call-super-method. * tests/012/oop-mi.expected: Updated. * txr.1: Updated.
* OOP: implementing multiple inheritance.Kaz Kylheku2019-12-111-0/+8
Multiple inheritance is too useful to ignore any longer. * lib.c (subtypep): Perform subtypep calculation between two struct types via the new struct_subtype_p function. It's too complicated now to do with ad hoc code outside of struct.c. * share/txr/stdlib/struct.tl (defstruct): This macro now needs to deal with the super argument being possibly a list of base types instead of a single one. * strut.c (struct struct_type): Member super and super_handle are removed. New member nsupers, supers, and sus. (struct_init): The super function re-registered; it has an optional argument. (call_stinitfun_chain): The compat code here must now access the supertype differently. We don't bother dealing with multiple inheritance in the compat case; programs requesting compatibility with TXR 151 shoudn't be trying to use multiple inheritance. (get_struct_handles, count_super_stslots, get_super_slots, find_super_for_slot): New static functions, to off-load some new complexity from make_struct_type. (make_struct_type): Handle the increased complexity due to multiple inheritance. (super): Takes an additional argument now, to request which supertype to retrieve. Defaults to zero: the first one. (struct_type_destroy): Free the sus array. (struct_type_mark): Mark the supers slot. (call_initfun_chain): Call init functions of all bases, in right-to-left order. (call_postinitfun_chain): Likewise for postinit functions. (call_super_method, call_super_fun, super_method): Use the first base as the supertype. This requirement feels bad; it needs to be revisited. (do_struct_subtype_p): New static function. (struct_subtype_p): New function. (ancestor_with_static_slot): New static function. (method_name): Revised for multiple inheritance; now relies on ancestor_with_static_slot to find the original ancestor that has brought in a method, so we can use that type in the method name. * struct.h (super): Declaration updated. (struct_subtype_p): Declared. * tests/012/oop-mi.expected: New file. * tests/012/oop-mi.tl: New test cases. * txr.1: Revised in order to document multiple inheritance.