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Datei: State.thy Sprache: Isabelle

Original von: Isabelle^©

(*  Title:      HOL/NanoJava/State.thy
    Author:     David von Oheimb
    Copyright   2001 Technische Universitaet Muenchen
*)

section "Program State"

theory State imports TypeRel begin

definition body :: "cname \ mname => stmt" where
"body \ \(C,m). bdy (the (method C m))"

text \<open>Locations, i.e.\ abstract references to objects\<close>
typedecl loc

datatype val
  = Null        \<comment> \<open>null reference\<close>
  | Addr loc    \<comment> \<open>address, i.e. location of object\<close>

type_synonym fields
        = "(fname \ val)"

type_synonym
        obj = "cname \ fields"

translations
  (type) "fields" \<leftharpoondown> (type) "fname => val option"
  (type) "obj"    \<leftharpoondown> (type) "cname \<times> fields"

definition init_vars :: "('a \ 'b) => ('a \ val)" where
"init_vars m == map_option (\T. Null) o m"

text \<open>private:\<close>
type_synonym heap = "loc \ obj"
type_synonym locals = "vname \ val"

text \<open>private:\<close>
record  state
        = heap   :: heap
          locals :: locals

translations
  (type) "heap" \<leftharpoondown> (type) "loc => obj option"
  (type) "locals" \<leftharpoondown> (type) "vname => val option"
  (type) "state" \<leftharpoondown> (type) "(|heap :: heap, locals :: locals|)"

definition del_locs :: "state => state" where
"del_locs s \ s (| locals := Map.empty |)"

definition init_locs     :: "cname => mname => state => state" where
"init_locs C m s \ s (| locals := locals s ++
                         init_vars (map_of (lcl (the (method C m)))) |)"

text \<open>The first parameter of \<^term>\<open>set_locs\<close> is of type \<^typ>\<open>state\<close>
        rather than \<^typ>\<open>locals\<close> in order to keep \<^typ>\<open>locals\<close> private.\<close>
definition set_locs :: "state => state => state" where
"set_locs s s' \ s' (| locals := locals s |)"

definition get_local     :: "state => vname => val" ("_<_>" [99,0] 99) where
"get_local s x \ the (locals s x)"

\<comment> \<open>local function:\<close>
definition get_obj       :: "state => loc => obj" where
"get_obj s a \ the (heap s a)"

definition obj_class     :: "state => loc => cname" where
"obj_class s a \ fst (get_obj s a)"

definition get_field     :: "state => loc => fname => val" where
"get_field s a f \ the (snd (get_obj s a) f)"

\<comment> \<open>local function:\<close>
definition hupd       :: "loc => obj => state => state"   ("hupd'(_\_')" [10,10] 1000) where
"hupd a obj s \ s (| heap := ((heap s)(a\obj))|)"

definition lupd       :: "vname => val => state => state" ("lupd'(_\_')" [10,10] 1000) where
"lupd x v s \ s (| locals := ((locals s)(x\v ))|)"

definition new_obj :: "loc => cname => state => state" where
"new_obj a C \ hupd(a\(C,init_vars (field C)))"

definition upd_obj    :: "loc => fname => val => state => state" where
"upd_obj a f v s \ let (C,fs) = the (heap s a) in hupd(a\(C,fs(f\v))) s"

definition new_Addr      :: "state => val" where
"new_Addr s == SOME v. (\a. v = Addr a \ (heap s) a = None) | v = Null"

subsection "Properties not used in the meta theory"

lemma locals_upd_id [simp]: "s\locals := locals s\ = s"
by simp

lemma lupd_get_local_same [simp]: "lupd(x\v) s = v"
by (simp add: lupd_def get_local_def)

lemma lupd_get_local_other [simp]: "x \ y \ lupd(x\v) s = s"
apply (drule not_sym)
by (simp add: lupd_def get_local_def)

lemma get_field_lupd [simp]:
  "get_field (lupd(x\y) s) a f = get_field s a f"
by (simp add: lupd_def get_field_def get_obj_def)

lemma get_field_set_locs [simp]:
  "get_field (set_locs l s) a f = get_field s a f"
by (simp add: lupd_def get_field_def set_locs_def get_obj_def)

lemma get_field_del_locs [simp]:
  "get_field (del_locs s) a f = get_field s a f"
by (simp add: lupd_def get_field_def del_locs_def get_obj_def)

lemma new_obj_get_local [simp]: "new_obj a C s = s"
by (simp add: new_obj_def hupd_def get_local_def)

lemma heap_lupd [simp]: "heap (lupd(x\y) s) = heap s"
by (simp add: lupd_def)

lemma heap_hupd_same [simp]: "heap (hupd(a\obj) s) a = Some obj"
by (simp add: hupd_def)

lemma heap_hupd_other [simp]: "aa \ a \ heap (hupd(aa\obj) s) a = heap s a"
apply (drule not_sym)
by (simp add: hupd_def)

lemma hupd_hupd [simp]: "hupd(a\obj) (hupd(a\obj') s) = hupd(a\obj) s"
by (simp add: hupd_def)

lemma heap_del_locs [simp]: "heap (del_locs s) = heap s"
by (simp add: del_locs_def)

lemma heap_set_locs [simp]: "heap (set_locs l s) = heap s"
by (simp add: set_locs_def)

lemma hupd_lupd [simp]:
  "hupd(a\obj) (lupd(x\y) s) = lupd(x\y) (hupd(a\obj) s)"
by (simp add: hupd_def lupd_def)

lemma hupd_del_locs [simp]:
  "hupd(a\obj) (del_locs s) = del_locs (hupd(a\obj) s)"
by (simp add: hupd_def del_locs_def)

lemma new_obj_lupd [simp]:
  "new_obj a C (lupd(x\y) s) = lupd(x\y) (new_obj a C s)"
by (simp add: new_obj_def)

lemma new_obj_del_locs [simp]:
  "new_obj a C (del_locs s) = del_locs (new_obj a C s)"
by (simp add: new_obj_def)

lemma upd_obj_lupd [simp]:
  "upd_obj a f v (lupd(x\y) s) = lupd(x\y) (upd_obj a f v s)"
by (simp add: upd_obj_def Let_def split_beta)

lemma upd_obj_del_locs [simp]:
  "upd_obj a f v (del_locs s) = del_locs (upd_obj a f v s)"
by (simp add: upd_obj_def Let_def split_beta)

lemma get_field_hupd_same [simp]:
"get_field (hupd(a\(C, fs)) s) a = the \ fs"
apply (rule ext)
by (simp add: get_field_def get_obj_def)

lemma get_field_hupd_other [simp]:
"aa \ a \ get_field (hupd(aa\obj) s) a = get_field s a"
apply (rule ext)
by (simp add: get_field_def get_obj_def)

lemma new_AddrD:
"new_Addr s = v \ (\a. v = Addr a \ heap s a = None) | v = Null"
apply (unfold new_Addr_def)
apply (erule subst)
apply (rule someI)
apply (rule disjI2)
apply (rule HOL.refl)
done

end

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