src/HOL/Bali/Type.thy
author blanchet
Tue, 09 Sep 2014 20:51:36 +0200
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(*  Title:      HOL/Bali/Type.thy
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    Author:     David von Oheimb
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*)
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header {* Java types *}
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theory Type imports Name begin
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text {*
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simplifications:
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\begin{itemize}
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\item only the most important primitive types
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\item the null type is regarded as reference type
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\end{itemize}
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*}
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datatype_new prim_ty        --{* primitive type, cf. 4.2 *}
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        = Void          --{* result type of void methods *}
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        | Boolean
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        | Integer
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datatype_new ref_ty         --{* reference type, cf. 4.3 *}
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        = NullT         --{* null type, cf. 4.1 *}
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        | IfaceT qtname --{* interface type *}
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        | ClassT qtname --{* class type *}
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        | ArrayT ty     --{* array type *}
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and ty                  --{* any type, cf. 4.1 *}
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        = PrimT prim_ty --{* primitive type *}
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        | RefT  ref_ty  --{* reference type *}
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abbreviation "NT == RefT NullT"
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abbreviation "Iface I == RefT (IfaceT I)"
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abbreviation "Class C == RefT (ClassT C)"
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abbreviation Array :: "ty \<Rightarrow> ty"  ("_.[]" [90] 90)
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  where "T.[] == RefT (ArrayT T)"
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definition
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  the_Class :: "ty \<Rightarrow> qtname"
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  where "the_Class T = (SOME C. T = Class C)" (** primrec not possible here **)
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lemma the_Class_eq [simp]: "the_Class (Class C)= C"
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by (auto simp add: the_Class_def)
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end