1. 07 Sep, 2018 1 commit
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  16. 31 May, 2018 2 commits
    • Jean-Christophe Filliatre's avatar
      new VC to prove well-foundedness of user-provided variants · 4af9081d
      Jean-Christophe Filliatre authored
      fixes issue #57
      
      a new theory relations.WellFounded is introduced for this purpose
      (and must be imported whenever one wants to make use of a custom
      relation for a variant)
      
      it defines, inductively, a notion of accessibility for a given
      predicate R (x is accessible whenever all elements smaller than x for R
      are alreay accessible)
      
      whenever one has to prove that a variant decreases, a new VC is also
      generated, to show that the old value of the variant is accessible
      for the order relation
      
      note: accessibility being defined inductively, proving well-foundedness
      is out of reach of SMT solvers; but at least this is sound now
      4af9081d
    • Jean-Christophe Filliatre's avatar
      Array63: added swap and init · e0cd1156
      Jean-Christophe Filliatre authored
      e0cd1156
  17. 24 May, 2018 1 commit
  18. 17 May, 2018 1 commit
    • Jean-Christophe Filliatre's avatar
      new module mach.array.ArrayInt63 for arrays of 63-bit integers · bdf87cce
      Jean-Christophe Filliatre authored
      the model is a sequence of integers, of type 'seq int'
      the idea is to lower the pollution of VCs with values of int63 (and
      subsequent to_int operations)
      
      drawbacks:
      - this new type of arrays is not compatible with the one
        from mach.array.Array63
      - when using both, we cannot use syntax [] and []<- for both types
        in programs (no overloading in programs) and thus we have to use
        A.([]) and A.([]<-) for one of them
      bdf87cce
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