(* Title: HOL/MicroJava/J/Conform.thy
ID: $Id$
Author: David von Oheimb
Copyright 1999 Technische Universitaet Muenchen
Conformity relations for type safety of Java
*)
Conform = State + WellType +
types 'c env_ = "'c prog \\<times> (vname \\<leadsto> ty)" (* same as env of WellType.thy *)
constdefs
hext :: "aheap => aheap => bool" ( "_\\<le>|_" [51,51] 50)
"h\\<le>|h' == \\<forall>a C fs. h a = Some(C,fs) --> (\\<exists>fs'. h' a = Some(C,fs'))"
conf :: "'c prog => aheap => val => ty => bool" ( "_,_\\<turnstile>_::\\<preceq>_" [51,51,51,51] 50)
"G,h\\<turnstile>v::\\<preceq>T == \\<exists>T'. typeof (option_map obj_ty o h) v = Some T' \\<and> G\\<turnstile>T'\\<preceq>T"
lconf :: "'c prog => aheap => ('a \\<leadsto> val) => ('a \\<leadsto> ty) => bool"
("_,_\\<turnstile>_[::\\<preceq>]_" [51,51,51,51] 50)
"G,h\\<turnstile>vs[::\\<preceq>]Ts == \\<forall>n T. Ts n = Some T --> (\\<exists>v. vs n = Some v \\<and> G,h\\<turnstile>v::\\<preceq>T)"
oconf :: "'c prog => aheap => obj => bool" ("_,_\\<turnstile>_\\<surd>" [51,51,51] 50)
"G,h\\<turnstile>obj\\<surd> == G,h\\<turnstile>snd obj[::\\<preceq>]map_of (fields (G,fst obj))"
hconf :: "'c prog => aheap => bool" ("_\\<turnstile>h _\\<surd>" [51,51] 50)
"G\\<turnstile>h h\\<surd> == \\<forall>a obj. h a = Some obj --> G,h\\<turnstile>obj\\<surd>"
conforms :: "state => java_mb env_ => bool" ("_::\\<preceq>_" [51,51] 50)
"s::\\<preceq>E == prg E\\<turnstile>h heap s\\<surd> \\<and> prg E,heap s\\<turnstile>locals s[::\\<preceq>]localT E"
end