(* Title: HOL/MicroJava/J/Type.thy
Author: David von Oheimb
Copyright 1999 Technische Universitaet Muenchen
*)
header {* \isaheader{Java types} *}
theory Type imports JBasis begin
typedecl cnam
instantiation cnam :: equal
begin
definition "HOL.equal (cn :: cnam) cn' \<longleftrightarrow> cn = cn'"
instance by default (simp add: equal_cnam_def)
end
text {* These instantiations only ensure that the merge in theory @{text "MicroJava"} succeeds. FIXME *}
instantiation cnam :: typerep
begin
definition "typerep_class.typerep \<equiv> \<lambda>_ :: cnam itself. Typerep.Typerep (STR ''Type.cnam'') []"
instance ..
end
instantiation cnam :: term_of
begin
definition "term_of_class.term_of (C :: cnam) \<equiv>
Code_Evaluation.Const (STR ''dummy_cnam'') (Typerep.Typerep (STR ''Type.cnam'') [])"
instance ..
end
instantiation cnam :: partial_term_of
begin
definition "partial_term_of_class.partial_term_of (C :: cnam itself) n = undefined"
instance ..
end
-- "exceptions"
datatype
xcpt
= NullPointer
| ClassCast
| OutOfMemory
-- "class names"
datatype cname
= Object
| Xcpt xcpt
| Cname cnam
typedecl vnam -- "variable or field name"
instantiation vnam :: equal
begin
definition "HOL.equal (vn :: vnam) vn' \<longleftrightarrow> vn = vn'"
instance by default (simp add: equal_vnam_def)
end
instantiation vnam :: typerep
begin
definition "typerep_class.typerep \<equiv> \<lambda>_ :: vnam itself. Typerep.Typerep (STR ''Type.vnam'') []"
instance ..
end
instantiation vnam :: term_of
begin
definition "term_of_class.term_of (V :: vnam) \<equiv>
Code_Evaluation.Const (STR ''dummy_vnam'') (Typerep.Typerep (STR ''Type.vnam'') [])"
instance ..
end
instantiation vnam :: partial_term_of
begin
definition "partial_term_of_class.partial_term_of (V :: vnam itself) n = undefined"
instance ..
end
typedecl mname -- "method name"
instantiation mname :: equal
begin
definition "HOL.equal (M :: mname) M' \<longleftrightarrow> M = M'"
instance by default (simp add: equal_mname_def)
end
instantiation mname :: typerep
begin
definition "typerep_class.typerep \<equiv> \<lambda>_ :: mname itself. Typerep.Typerep (STR ''Type.mname'') []"
instance ..
end
instantiation mname :: term_of
begin
definition "term_of_class.term_of (M :: mname) \<equiv>
Code_Evaluation.Const (STR ''dummy_mname'') (Typerep.Typerep (STR ''Type.mname'') [])"
instance ..
end
instantiation mname :: partial_term_of
begin
definition "partial_term_of_class.partial_term_of (M :: mname itself) n = undefined"
instance ..
end
-- "names for @{text This} pointer and local/field variables"
datatype vname
= This
| VName vnam
-- "primitive type, cf. 4.2"
datatype prim_ty
= Void -- "'result type' of void methods"
| Boolean
| Integer
-- "reference type, cf. 4.3"
datatype ref_ty
= NullT -- "null type, cf. 4.1"
| ClassT cname -- "class type"
-- "any type, cf. 4.1"
datatype ty
= PrimT prim_ty -- "primitive type"
| RefT ref_ty -- "reference type"
abbreviation NT :: ty
where "NT == RefT NullT"
abbreviation Class :: "cname => ty"
where "Class C == RefT (ClassT C)"
end