Method Dispatch in Oforth M. Franck Bensusan presented by M. Anton - PowerPoint PPT Presentation

Mar 15, 2023 •341 likes •399 views

Method Dispatch in Oforth M. Franck Bensusan presented by M. Anton Ertl, TU Wien Methods and classes in Oforth Object Class new: A A Class new: A1 A1 method: foo "Foo for A1 :" . self . ; Object Class new: B B method: foo Duck

Method Dispatch in Oforth M. Franck Bensusan presented by M. Anton Ertl, TU Wien
Methods and classes in Oforth Object Class new: A A Class new: A1 A1 method: foo "Foo for A1 :" . self . ; Object Class new: B B method: foo • Duck typing "Foo for B :" . self . ; Send any message to any object A method: bar • Classes are never closed "Bar for A :" . self . ; • Dispatch matrix grows A virtual: foo2 in both directions "to be redefined" abort ; • virtual: can be overridden A1 method: foo2 method: cannot "Redefined: " . self . ; A1 new foo B new foo A new dup bar foo2 A1 new dup bar foo2
Method dispatch test $1, TOS jne LcallMethodInteger Method virtual table (MVT) test TOS, TOS One per method selector je LcallMethodNull class index used for access class A A object movl (TOS), r0 index=5 $nnnnn005 attribute a andl 0x00000FFF, r0 attribute b cmpl IDClass, r0 foo MVT of foo je LcallMethodClass MVT pointer size=10 polymorphic polymorphic movl virtualTable(r1), r2 polymorphic polymorphic cmp (r2),r0 foo for class 5 (A) polymorphic jl reallocMVT foo for class 7 (B) movl (r2, r0, 4), r3 jmp *r3
MVT initialization • initially 0 slots • grows on method call • new slots initially polymorphic • polymorphic looks up method linear search of methods per class and all superclasses stores result in MVT
Optimization • self calls to method: s • Method calls to literal objects • Object method: s

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