By Arto Salomaa
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P. ere in the design. In fact. the exact manner in which the number of arguments is retrieved at choice point creation time is not al all explained in [WarS3. War8S]. Moreover. upon private inquiry. David H. D. Warren could not remember whether that was an incidental omission. So we chose to introduce this global variable as opposed to a register as no such explicit register was specified for the original WAM. me!! me In conclusion, there are three patterns of code translations for a procedure definition in e3, depending on whether it has one, two, or more than two clauses.
Three new I3 instructions are added to those already in I2.. They are to deal with the choice point for mu l tiple clause definitions. As expected . these instructions correspond. respectively. to (I) a first. (2) an intennediate (but non ultimate). and (3) a last. cl ause of a definition. They are: manipulation needed 1. me_else 2. 3. • an address in the code area). They have for effect. respectively: 1. to allocate to L to it; a new choice point frame on the stack and the other fie lds according to the current setting its context.
Which all variables that must be reset have been recorded. • The current top of heap (value of register H). which is needed to recover (garbage) heap space of all the structures and variables constructed during the failed attempt which will have resul te d in coming back to this choice point. In summary. a c h oice point frame is allocated on the stack looking thus:3 3In (WarS3]. David Wam:n does nol include the arily in a choice point. as we do here. lie sets up things slightly d i fferenlly SO that this number can always be quickly compute d .