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src/HOL/BCV/Types0.thy
author wenzelm
Tue, 28 Mar 2000 12:28:24 +0200
changeset 8599 58b6f99dd5a9
parent 7626 5997f35954d7
permissions -rw-r--r--
fixed railqtoken;
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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5997f35954d7 A new theory: a model of bytecode verification.
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(*  Title:      HOL/BCV/Types0.thy
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    ID:         $Id$
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    Author:     Tobias Nipkow
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    Copyright   1999 TUM
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Types for the register machine













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*)













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Types0 = SemiLattice +













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datatype typ = Atyp | Btyp | Ctyp | Top













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instance typ :: ord













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instance typ :: plus













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defs













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le_typ "t1 <= t2 == (t1=t2) | (t1=Atyp & t2=Btyp) | (t2=Top)"













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less_typ "(t1::typ) < t2 == t1 <= t2 & t1 ~= t2"













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plus_typ "t1 + t2 == if t1<=t2 then t2 else if t2 <= t1 then t1 else Top"













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end















isabelle